1 #include <linux/config.h>
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/proc_fs.h>
6 #include <linux/skbuff.h>
7 #include <linux/netfilter.h>
8 #include <linux/seq_file.h>
9 #include <net/protocol.h>
11 #include "nf_internals.h"
13 /* Internal logging interface, which relies on the real
16 #define NF_LOG_PREFIXLEN 128
18 static struct nf_logger *nf_logging[NPROTO]; /* = NULL */
19 static DEFINE_SPINLOCK(nf_log_lock);
21 /* return EBUSY if somebody else is registered, EEXIST if the same logger
22 * is registred, 0 on success. */
23 int nf_log_register(int pf, struct nf_logger *logger)
27 /* Any setup of logging members must be done before
28 * substituting pointer. */
29 spin_lock(&nf_log_lock);
30 if (!nf_logging[pf]) {
31 rcu_assign_pointer(nf_logging[pf], logger);
33 } else if (nf_logging[pf] == logger)
36 spin_unlock(&nf_log_lock);
39 EXPORT_SYMBOL(nf_log_register);
41 void nf_log_unregister_pf(int pf)
43 spin_lock(&nf_log_lock);
44 nf_logging[pf] = NULL;
45 spin_unlock(&nf_log_lock);
47 /* Give time to concurrent readers. */
50 EXPORT_SYMBOL(nf_log_unregister_pf);
52 void nf_log_unregister_logger(struct nf_logger *logger)
56 spin_lock(&nf_log_lock);
57 for (i = 0; i < NPROTO; i++) {
58 if (nf_logging[i] == logger)
61 spin_unlock(&nf_log_lock);
65 EXPORT_SYMBOL(nf_log_unregister_logger);
67 void nf_log_packet(int pf,
69 const struct sk_buff *skb,
70 const struct net_device *in,
71 const struct net_device *out,
72 struct nf_loginfo *loginfo,
76 char prefix[NF_LOG_PREFIXLEN];
77 struct nf_logger *logger;
80 logger = rcu_dereference(nf_logging[pf]);
83 vsnprintf(prefix, sizeof(prefix), fmt, args);
85 /* We must read logging before nf_logfn[pf] */
86 logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
87 } else if (net_ratelimit()) {
88 printk(KERN_WARNING "nf_log_packet: can\'t log since "
89 "no backend logging module loaded in! Please either "
90 "load one, or disable logging explicitly\n");
94 EXPORT_SYMBOL(nf_log_packet);
97 static void *seq_start(struct seq_file *seq, loff_t *pos)
107 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
117 static void seq_stop(struct seq_file *s, void *v)
122 static int seq_show(struct seq_file *s, void *v)
125 const struct nf_logger *logger;
127 logger = rcu_dereference(nf_logging[*pos]);
130 return seq_printf(s, "%2lld NONE\n", *pos);
132 return seq_printf(s, "%2lld %s\n", *pos, logger->name);
135 static struct seq_operations nflog_seq_ops = {
142 static int nflog_open(struct inode *inode, struct file *file)
144 return seq_open(file, &nflog_seq_ops);
147 static struct file_operations nflog_file_ops = {
148 .owner = THIS_MODULE,
152 .release = seq_release,
158 int __init netfilter_log_init(void)
160 #ifdef CONFIG_PROC_FS
161 struct proc_dir_entry *pde;
162 pde = create_proc_entry("nf_log", S_IRUGO, proc_net_netfilter);
167 pde->proc_fops = &nflog_file_ops;