![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
179 lines
3.6 KiB
C
179 lines
3.6 KiB
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter.h>
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#include <linux/seq_file.h>
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#include <net/protocol.h>
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#include "nf_internals.h"
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/* Internal logging interface, which relies on the real
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LOG target modules */
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#define NF_LOG_PREFIXLEN 128
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static struct nf_logger *nf_loggers[NPROTO];
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static DEFINE_MUTEX(nf_log_mutex);
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/* return EBUSY if somebody else is registered, EEXIST if the same logger
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* is registred, 0 on success. */
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int nf_log_register(int pf, struct nf_logger *logger)
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{
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int ret;
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if (pf >= NPROTO)
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return -EINVAL;
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/* Any setup of logging members must be done before
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* substituting pointer. */
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ret = mutex_lock_interruptible(&nf_log_mutex);
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if (ret < 0)
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return ret;
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if (!nf_loggers[pf])
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rcu_assign_pointer(nf_loggers[pf], logger);
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else if (nf_loggers[pf] == logger)
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ret = -EEXIST;
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else
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ret = -EBUSY;
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mutex_unlock(&nf_log_mutex);
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return ret;
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}
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EXPORT_SYMBOL(nf_log_register);
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void nf_log_unregister_pf(int pf)
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{
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if (pf >= NPROTO)
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return;
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mutex_lock(&nf_log_mutex);
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rcu_assign_pointer(nf_loggers[pf], NULL);
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mutex_unlock(&nf_log_mutex);
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/* Give time to concurrent readers. */
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synchronize_rcu();
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}
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EXPORT_SYMBOL(nf_log_unregister_pf);
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void nf_log_unregister(struct nf_logger *logger)
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{
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int i;
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mutex_lock(&nf_log_mutex);
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for (i = 0; i < NPROTO; i++) {
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if (nf_loggers[i] == logger)
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rcu_assign_pointer(nf_loggers[i], NULL);
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}
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mutex_unlock(&nf_log_mutex);
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synchronize_rcu();
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}
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EXPORT_SYMBOL(nf_log_unregister);
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void nf_log_packet(int pf,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_loginfo *loginfo,
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const char *fmt, ...)
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{
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va_list args;
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char prefix[NF_LOG_PREFIXLEN];
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struct nf_logger *logger;
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rcu_read_lock();
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logger = rcu_dereference(nf_loggers[pf]);
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if (logger) {
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va_start(args, fmt);
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vsnprintf(prefix, sizeof(prefix), fmt, args);
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va_end(args);
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/* We must read logging before nf_logfn[pf] */
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logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
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} else if (net_ratelimit()) {
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printk(KERN_WARNING "nf_log_packet: can\'t log since "
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"no backend logging module loaded in! Please either "
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"load one, or disable logging explicitly\n");
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(nf_log_packet);
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#ifdef CONFIG_PROC_FS
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static void *seq_start(struct seq_file *seq, loff_t *pos)
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{
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rcu_read_lock();
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if (*pos >= NPROTO)
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return NULL;
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return pos;
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}
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static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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if (*pos >= NPROTO)
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return NULL;
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return pos;
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}
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static void seq_stop(struct seq_file *s, void *v)
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{
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rcu_read_unlock();
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}
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static int seq_show(struct seq_file *s, void *v)
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{
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loff_t *pos = v;
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const struct nf_logger *logger;
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logger = rcu_dereference(nf_loggers[*pos]);
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if (!logger)
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return seq_printf(s, "%2lld NONE\n", *pos);
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return seq_printf(s, "%2lld %s\n", *pos, logger->name);
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}
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static struct seq_operations nflog_seq_ops = {
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.start = seq_start,
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.next = seq_next,
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.stop = seq_stop,
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.show = seq_show,
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};
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static int nflog_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &nflog_seq_ops);
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}
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static const struct file_operations nflog_file_ops = {
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.owner = THIS_MODULE,
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.open = nflog_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif /* PROC_FS */
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int __init netfilter_log_init(void)
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{
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *pde;
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pde = create_proc_entry("nf_log", S_IRUGO, proc_net_netfilter);
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if (!pde)
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return -1;
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pde->proc_fops = &nflog_file_ops;
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#endif
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return 0;
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}
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