1 #include <linux/kernel.h>
2 #include <linux/init.h>
3 #include <linux/module.h>
4 #include <linux/proc_fs.h>
5 #include <linux/skbuff.h>
6 #include <linux/netfilter.h>
7 #include <linux/seq_file.h>
8 #include <net/protocol.h>
9 #include <net/netfilter/nf_log.h>
11 #include "nf_internals.h"
13 /* Internal logging interface, which relies on the real
16 #define NF_LOG_PREFIXLEN 128
18 static const struct nf_logger *nf_loggers[NFPROTO_NUMPROTO] __read_mostly;
19 static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
20 static DEFINE_MUTEX(nf_log_mutex);
22 static struct nf_logger *__find_logger(int pf, const char *str_logger)
26 list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
27 if (!strnicmp(str_logger, t->name, strlen(t->name)))
34 /* return EEXIST if the same logger is registred, 0 on success. */
35 int nf_log_register(u_int8_t pf, struct nf_logger *logger)
37 const struct nf_logger *llog;
39 if (pf >= ARRAY_SIZE(nf_loggers))
42 mutex_lock(&nf_log_mutex);
44 if (pf == NFPROTO_UNSPEC) {
46 for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
47 list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
49 /* register at end of list to honor first register win */
50 list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
51 llog = rcu_dereference(nf_loggers[pf]);
53 rcu_assign_pointer(nf_loggers[pf], logger);
56 mutex_unlock(&nf_log_mutex);
60 EXPORT_SYMBOL(nf_log_register);
62 void nf_log_unregister(struct nf_logger *logger)
64 const struct nf_logger *c_logger;
67 mutex_lock(&nf_log_mutex);
68 for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) {
69 c_logger = rcu_dereference(nf_loggers[i]);
70 if (c_logger == logger)
71 rcu_assign_pointer(nf_loggers[i], NULL);
72 list_del(&logger->list[i]);
74 mutex_unlock(&nf_log_mutex);
78 EXPORT_SYMBOL(nf_log_unregister);
80 int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger)
82 mutex_lock(&nf_log_mutex);
83 if (__find_logger(pf, logger->name) == NULL) {
84 mutex_unlock(&nf_log_mutex);
87 rcu_assign_pointer(nf_loggers[pf], logger);
88 mutex_unlock(&nf_log_mutex);
91 EXPORT_SYMBOL(nf_log_bind_pf);
93 void nf_log_unbind_pf(u_int8_t pf)
95 mutex_lock(&nf_log_mutex);
96 rcu_assign_pointer(nf_loggers[pf], NULL);
97 mutex_unlock(&nf_log_mutex);
99 EXPORT_SYMBOL(nf_log_unbind_pf);
101 void nf_log_packet(u_int8_t pf,
102 unsigned int hooknum,
103 const struct sk_buff *skb,
104 const struct net_device *in,
105 const struct net_device *out,
106 const struct nf_loginfo *loginfo,
107 const char *fmt, ...)
110 char prefix[NF_LOG_PREFIXLEN];
111 const struct nf_logger *logger;
114 logger = rcu_dereference(nf_loggers[pf]);
117 vsnprintf(prefix, sizeof(prefix), fmt, args);
119 logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
123 EXPORT_SYMBOL(nf_log_packet);
125 #ifdef CONFIG_PROC_FS
126 static void *seq_start(struct seq_file *seq, loff_t *pos)
131 if (*pos >= ARRAY_SIZE(nf_loggers))
137 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
141 if (*pos >= ARRAY_SIZE(nf_loggers))
147 static void seq_stop(struct seq_file *s, void *v)
153 static int seq_show(struct seq_file *s, void *v)
156 const struct nf_logger *logger;
158 logger = rcu_dereference(nf_loggers[*pos]);
161 return seq_printf(s, "%2lld NONE\n", *pos);
163 return seq_printf(s, "%2lld %s\n", *pos, logger->name);
166 static const struct seq_operations nflog_seq_ops = {
173 static int nflog_open(struct inode *inode, struct file *file)
175 return seq_open(file, &nflog_seq_ops);
178 static const struct file_operations nflog_file_ops = {
179 .owner = THIS_MODULE,
183 .release = seq_release,
189 int __init netfilter_log_init(void)
192 #ifdef CONFIG_PROC_FS
193 if (!proc_create("nf_log", S_IRUGO,
194 proc_net_netfilter, &nflog_file_ops))
198 for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
199 INIT_LIST_HEAD(&(nf_loggers_l[i]));