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
17 #define NFLOGGER_NAME_LEN 64
19 static const struct nf_logger *nf_loggers[NFPROTO_NUMPROTO] __read_mostly;
20 static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
21 static DEFINE_MUTEX(nf_log_mutex);
23 static struct nf_logger *__find_logger(int pf, const char *str_logger)
27 list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
28 if (!strnicmp(str_logger, t->name, strlen(t->name)))
35 /* return EEXIST if the same logger is registred, 0 on success. */
36 int nf_log_register(u_int8_t pf, struct nf_logger *logger)
40 if (pf >= ARRAY_SIZE(nf_loggers))
43 for (i = 0; i < ARRAY_SIZE(logger->list); i++)
44 INIT_LIST_HEAD(&logger->list[i]);
46 mutex_lock(&nf_log_mutex);
48 if (pf == NFPROTO_UNSPEC) {
49 for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
50 list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
52 /* register at end of list to honor first register win */
53 list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
54 if (nf_loggers[pf] == NULL)
55 rcu_assign_pointer(nf_loggers[pf], logger);
58 mutex_unlock(&nf_log_mutex);
62 EXPORT_SYMBOL(nf_log_register);
64 void nf_log_unregister(struct nf_logger *logger)
68 mutex_lock(&nf_log_mutex);
69 for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) {
70 if (nf_loggers[i] == 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)
128 mutex_lock(&nf_log_mutex);
130 if (*pos >= ARRAY_SIZE(nf_loggers))
136 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
140 if (*pos >= ARRAY_SIZE(nf_loggers))
146 static void seq_stop(struct seq_file *s, void *v)
148 mutex_unlock(&nf_log_mutex);
151 static int seq_show(struct seq_file *s, void *v)
154 const struct nf_logger *logger;
158 logger = nf_loggers[*pos];
161 ret = seq_printf(s, "%2lld NONE (", *pos);
163 ret = seq_printf(s, "%2lld %s (", *pos, logger->name);
168 list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
169 ret = seq_printf(s, "%s", t->name);
172 if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
173 ret = seq_printf(s, ",");
179 return seq_printf(s, ")\n");
182 static const struct seq_operations nflog_seq_ops = {
189 static int nflog_open(struct inode *inode, struct file *file)
191 return seq_open(file, &nflog_seq_ops);
194 static const struct file_operations nflog_file_ops = {
195 .owner = THIS_MODULE,
199 .release = seq_release,
206 static struct ctl_path nf_log_sysctl_path[] = {
207 { .procname = "net", },
208 { .procname = "netfilter", },
209 { .procname = "nf_log", },
213 static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
214 static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
215 static struct ctl_table_header *nf_log_dir_header;
217 static int nf_log_proc_dostring(ctl_table *table, int write,
218 void __user *buffer, size_t *lenp, loff_t *ppos)
220 const struct nf_logger *logger;
221 char buf[NFLOGGER_NAME_LEN];
224 int tindex = (unsigned long)table->extra1;
227 if (size > sizeof(buf))
229 if (copy_from_user(buf, buffer, size))
232 if (!strcmp(buf, "NONE")) {
233 nf_log_unbind_pf(tindex);
236 mutex_lock(&nf_log_mutex);
237 logger = __find_logger(tindex, buf);
238 if (logger == NULL) {
239 mutex_unlock(&nf_log_mutex);
242 rcu_assign_pointer(nf_loggers[tindex], logger);
243 mutex_unlock(&nf_log_mutex);
245 mutex_lock(&nf_log_mutex);
246 logger = nf_loggers[tindex];
248 table->data = "NONE";
250 table->data = logger->name;
251 r = proc_dostring(table, write, buffer, lenp, ppos);
252 mutex_unlock(&nf_log_mutex);
258 static __init int netfilter_log_sysctl_init(void)
262 for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
263 snprintf(nf_log_sysctl_fnames[i-NFPROTO_UNSPEC], 3, "%d", i);
264 nf_log_sysctl_table[i].procname =
265 nf_log_sysctl_fnames[i-NFPROTO_UNSPEC];
266 nf_log_sysctl_table[i].data = NULL;
267 nf_log_sysctl_table[i].maxlen =
268 NFLOGGER_NAME_LEN * sizeof(char);
269 nf_log_sysctl_table[i].mode = 0644;
270 nf_log_sysctl_table[i].proc_handler = nf_log_proc_dostring;
271 nf_log_sysctl_table[i].extra1 = (void *)(unsigned long) i;
274 nf_log_dir_header = register_sysctl_paths(nf_log_sysctl_path,
275 nf_log_sysctl_table);
276 if (!nf_log_dir_header)
282 static __init int netfilter_log_sysctl_init(void)
286 #endif /* CONFIG_SYSCTL */
288 int __init netfilter_log_init(void)
291 #ifdef CONFIG_PROC_FS
292 if (!proc_create("nf_log", S_IRUGO,
293 proc_net_netfilter, &nflog_file_ops))
297 /* Errors will trigger panic, unroll on error is unnecessary. */
298 r = netfilter_log_sysctl_init();
302 for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
303 INIT_LIST_HEAD(&(nf_loggers_l[i]));