From f6ebe77f955d77a988ce726f0818ec0103b11323 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@netfilter.org>
Date: Tue, 9 Aug 2005 20:21:49 -0700
Subject: [NETFILTER]: split net/core/netfilter.c into net/netfilter/*.c

This patch doesn't introduce any code changes, but merely splits the
core netfilter code into four separate files.  It also moves it from
it's old location in net/core/ to the recently-created net/netfilter/
directory.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/netfilter/nf_log.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 net/netfilter/nf_log.c

(limited to 'net/netfilter/nf_log.c')

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
new file mode 100644
index 00000000000..ec58c4d2c66
--- /dev/null
+++ b/net/netfilter/nf_log.c
@@ -0,0 +1,165 @@
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#include <net/protocol.h>
+
+#include "nf_internals.h"
+
+/* Internal logging interface, which relies on the real 
+   LOG target modules */
+
+#define NF_LOG_PREFIXLEN		128
+
+static struct nf_logger *nf_logging[NPROTO]; /* = NULL */
+static DEFINE_SPINLOCK(nf_log_lock);
+
+int nf_log_register(int pf, struct nf_logger *logger)
+{
+	int ret = -EBUSY;
+
+	/* Any setup of logging members must be done before
+	 * substituting pointer. */
+	spin_lock(&nf_log_lock);
+	if (!nf_logging[pf]) {
+		rcu_assign_pointer(nf_logging[pf], logger);
+		ret = 0;
+	}
+	spin_unlock(&nf_log_lock);
+	return ret;
+}		
+EXPORT_SYMBOL(nf_log_register);
+
+void nf_log_unregister_pf(int pf)
+{
+	spin_lock(&nf_log_lock);
+	nf_logging[pf] = NULL;
+	spin_unlock(&nf_log_lock);
+
+	/* Give time to concurrent readers. */
+	synchronize_net();
+}
+EXPORT_SYMBOL(nf_log_unregister_pf);
+
+void nf_log_unregister_logger(struct nf_logger *logger)
+{
+	int i;
+
+	spin_lock(&nf_log_lock);
+	for (i = 0; i < NPROTO; i++) {
+		if (nf_logging[i] == logger)
+			nf_logging[i] = NULL;
+	}
+	spin_unlock(&nf_log_lock);
+
+	synchronize_net();
+}
+EXPORT_SYMBOL(nf_log_unregister_logger);
+
+void nf_log_packet(int pf,
+		   unsigned int hooknum,
+		   const struct sk_buff *skb,
+		   const struct net_device *in,
+		   const struct net_device *out,
+		   struct nf_loginfo *loginfo,
+		   const char *fmt, ...)
+{
+	va_list args;
+	char prefix[NF_LOG_PREFIXLEN];
+	struct nf_logger *logger;
+	
+	rcu_read_lock();
+	logger = rcu_dereference(nf_logging[pf]);
+	if (logger) {
+		va_start(args, fmt);
+		vsnprintf(prefix, sizeof(prefix), fmt, args);
+		va_end(args);
+		/* We must read logging before nf_logfn[pf] */
+		logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
+	} else if (net_ratelimit()) {
+		printk(KERN_WARNING "nf_log_packet: can\'t log since "
+		       "no backend logging module loaded in! Please either "
+		       "load one, or disable logging explicitly\n");
+	}
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL(nf_log_packet);
+
+#ifdef CONFIG_PROC_FS
+static void *seq_start(struct seq_file *seq, loff_t *pos)
+{
+	rcu_read_lock();
+
+	if (*pos >= NPROTO)
+		return NULL;
+
+	return pos;
+}
+
+static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	(*pos)++;
+
+	if (*pos >= NPROTO)
+		return NULL;
+
+	return pos;
+}
+
+static void seq_stop(struct seq_file *s, void *v)
+{
+	rcu_read_unlock();
+}
+
+static int seq_show(struct seq_file *s, void *v)
+{
+	loff_t *pos = v;
+	const struct nf_logger *logger;
+
+	logger = rcu_dereference(nf_logging[*pos]);
+
+	if (!logger)
+		return seq_printf(s, "%2lld NONE\n", *pos);
+	
+	return seq_printf(s, "%2lld %s\n", *pos, logger->name);
+}
+
+static struct seq_operations nflog_seq_ops = {
+	.start	= seq_start,
+	.next	= seq_next,
+	.stop	= seq_stop,
+	.show	= seq_show,
+};
+
+static int nflog_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &nflog_seq_ops);
+}
+
+static struct file_operations nflog_file_ops = {
+	.owner	 = THIS_MODULE,
+	.open	 = nflog_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+#endif /* PROC_FS */
+
+
+int __init netfilter_log_init(void)
+{
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *pde;
+	pde = create_proc_entry("nf_log", S_IRUGO, proc_net_netfilter);
+#endif
+	if (!pde)
+		return -1;
+
+	pde->proc_fops = &nflog_file_ops;
+
+	return 0;
+}
-- 
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