#include <linux/netfilter.h>
#include <linux/seq_file.h>
#include <net/protocol.h>
+#include <net/netfilter/nf_log.h>
#include "nf_internals.h"
-/* Internal logging interface, which relies on the real
+/* Internal logging interface, which relies on the real
LOG target modules */
#define NF_LOG_PREFIXLEN 128
+#define NFLOGGER_NAME_LEN 64
-static struct nf_logger *nf_loggers[NPROTO];
+static const struct nf_logger *nf_loggers[NFPROTO_NUMPROTO] __read_mostly;
+static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
static DEFINE_MUTEX(nf_log_mutex);
-/* return EBUSY if somebody else is registered, EEXIST if the same logger
- * is registred, 0 on success. */
-int nf_log_register(int pf, struct nf_logger *logger)
+static struct nf_logger *__find_logger(int pf, const char *str_logger)
{
- int ret;
-
- if (pf >= NPROTO)
- return -EINVAL;
+ struct nf_logger *t;
- /* Any setup of logging members must be done before
- * substituting pointer. */
- ret = mutex_lock_interruptible(&nf_log_mutex);
- if (ret < 0)
- return ret;
-
- if (!nf_loggers[pf])
- rcu_assign_pointer(nf_loggers[pf], logger);
- else if (nf_loggers[pf] == logger)
- ret = -EEXIST;
- else
- ret = -EBUSY;
+ list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
+ if (!strnicmp(str_logger, t->name, strlen(t->name)))
+ return t;
+ }
- mutex_unlock(&nf_log_mutex);
- return ret;
+ return NULL;
}
-EXPORT_SYMBOL(nf_log_register);
-void nf_log_unregister_pf(int pf)
+/* return EEXIST if the same logger is registred, 0 on success. */
+int nf_log_register(u_int8_t pf, struct nf_logger *logger)
{
- if (pf >= NPROTO)
- return;
+ const struct nf_logger *llog;
+ int i;
+
+ if (pf >= ARRAY_SIZE(nf_loggers))
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(logger->list); i++)
+ INIT_LIST_HEAD(&logger->list[i]);
+
mutex_lock(&nf_log_mutex);
- rcu_assign_pointer(nf_loggers[pf], NULL);
+
+ if (pf == NFPROTO_UNSPEC) {
+ for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
+ list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
+ } else {
+ /* register at end of list to honor first register win */
+ list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
+ llog = rcu_dereference(nf_loggers[pf]);
+ if (llog == NULL)
+ rcu_assign_pointer(nf_loggers[pf], logger);
+ }
+
mutex_unlock(&nf_log_mutex);
- /* Give time to concurrent readers. */
- synchronize_rcu();
+ return 0;
}
-EXPORT_SYMBOL(nf_log_unregister_pf);
+EXPORT_SYMBOL(nf_log_register);
void nf_log_unregister(struct nf_logger *logger)
{
+ const struct nf_logger *c_logger;
int i;
mutex_lock(&nf_log_mutex);
- for (i = 0; i < NPROTO; i++) {
- if (nf_loggers[i] == logger)
+ for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) {
+ c_logger = rcu_dereference(nf_loggers[i]);
+ if (c_logger == logger)
rcu_assign_pointer(nf_loggers[i], NULL);
+ list_del(&logger->list[i]);
}
mutex_unlock(&nf_log_mutex);
}
EXPORT_SYMBOL(nf_log_unregister);
-void nf_log_packet(int pf,
+int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger)
+{
+ mutex_lock(&nf_log_mutex);
+ if (__find_logger(pf, logger->name) == NULL) {
+ mutex_unlock(&nf_log_mutex);
+ return -ENOENT;
+ }
+ rcu_assign_pointer(nf_loggers[pf], logger);
+ mutex_unlock(&nf_log_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(nf_log_bind_pf);
+
+void nf_log_unbind_pf(u_int8_t pf)
+{
+ mutex_lock(&nf_log_mutex);
+ rcu_assign_pointer(nf_loggers[pf], NULL);
+ mutex_unlock(&nf_log_mutex);
+}
+EXPORT_SYMBOL(nf_log_unbind_pf);
+
+void nf_log_packet(u_int8_t pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
- struct nf_loginfo *loginfo,
+ const struct nf_loginfo *loginfo,
const char *fmt, ...)
{
va_list args;
char prefix[NF_LOG_PREFIXLEN];
- struct nf_logger *logger;
+ const struct nf_logger *logger;
rcu_read_lock();
logger = rcu_dereference(nf_loggers[pf]);
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();
}
#ifdef CONFIG_PROC_FS
static void *seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU)
{
rcu_read_lock();
- if (*pos >= NPROTO)
+ if (*pos >= ARRAY_SIZE(nf_loggers))
return NULL;
return pos;
{
(*pos)++;
- if (*pos >= NPROTO)
+ if (*pos >= ARRAY_SIZE(nf_loggers))
return NULL;
return pos;
}
static void seq_stop(struct seq_file *s, void *v)
+ __releases(RCU)
{
rcu_read_unlock();
}
{
loff_t *pos = v;
const struct nf_logger *logger;
+ struct nf_logger *t;
+ int ret;
logger = rcu_dereference(nf_loggers[*pos]);
if (!logger)
- return seq_printf(s, "%2lld NONE\n", *pos);
+ ret = seq_printf(s, "%2lld NONE (", *pos);
+ else
+ ret = seq_printf(s, "%2lld %s (", *pos, logger->name);
+
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&nf_log_mutex);
+ list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
+ ret = seq_printf(s, "%s", t->name);
+ if (ret < 0) {
+ mutex_unlock(&nf_log_mutex);
+ return ret;
+ }
+ if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
+ ret = seq_printf(s, ",");
+ if (ret < 0) {
+ mutex_unlock(&nf_log_mutex);
+ return ret;
+ }
+ }
+ }
+ mutex_unlock(&nf_log_mutex);
- return seq_printf(s, "%2lld %s\n", *pos, logger->name);
+ return seq_printf(s, ")\n");
}
-static struct seq_operations nflog_seq_ops = {
+static const struct seq_operations nflog_seq_ops = {
.start = seq_start,
.next = seq_next,
.stop = seq_stop,
.release = seq_release,
};
+
#endif /* PROC_FS */
+#ifdef CONFIG_SYSCTL
+static struct ctl_path nf_log_sysctl_path[] = {
+ { .procname = "net", .ctl_name = CTL_NET, },
+ { .procname = "netfilter", .ctl_name = NET_NETFILTER, },
+ { .procname = "nf_log", .ctl_name = CTL_UNNUMBERED, },
+ { }
+};
+
+static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
+static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
+static struct ctl_table_header *nf_log_dir_header;
+
+static int nf_log_proc_dostring(ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ const struct nf_logger *logger;
+ char buf[NFLOGGER_NAME_LEN];
+ size_t size = *lenp;
+ int r = 0;
+ int tindex = (unsigned long)table->extra1;
+
+ if (write) {
+ if (size > sizeof(buf))
+ size = sizeof(buf);
+ if (copy_from_user(buf, buffer, size))
+ return -EFAULT;
+
+ if (!strcmp(buf, "NONE")) {
+ nf_log_unbind_pf(tindex);
+ return 0;
+ }
+ mutex_lock(&nf_log_mutex);
+ logger = __find_logger(tindex, buf);
+ if (logger == NULL) {
+ mutex_unlock(&nf_log_mutex);
+ return -ENOENT;
+ }
+ rcu_assign_pointer(nf_loggers[tindex], logger);
+ mutex_unlock(&nf_log_mutex);
+ } else {
+ mutex_lock(&nf_log_mutex);
+ logger = nf_loggers[tindex];
+ if (!logger)
+ table->data = "NONE";
+ else
+ table->data = logger->name;
+ r = proc_dostring(table, write, buffer, lenp, ppos);
+ mutex_unlock(&nf_log_mutex);
+ }
+
+ return r;
+}
+
+static __init int netfilter_log_sysctl_init(void)
+{
+ int i;
+
+ for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
+ snprintf(nf_log_sysctl_fnames[i-NFPROTO_UNSPEC], 3, "%d", i);
+ nf_log_sysctl_table[i].ctl_name = CTL_UNNUMBERED;
+ nf_log_sysctl_table[i].procname =
+ nf_log_sysctl_fnames[i-NFPROTO_UNSPEC];
+ nf_log_sysctl_table[i].data = NULL;
+ nf_log_sysctl_table[i].maxlen =
+ NFLOGGER_NAME_LEN * sizeof(char);
+ nf_log_sysctl_table[i].mode = 0644;
+ nf_log_sysctl_table[i].proc_handler = nf_log_proc_dostring;
+ nf_log_sysctl_table[i].extra1 = (void *)(unsigned long) i;
+ }
+
+ nf_log_dir_header = register_sysctl_paths(nf_log_sysctl_path,
+ nf_log_sysctl_table);
+ if (!nf_log_dir_header)
+ return -ENOMEM;
+
+ return 0;
+}
+#else
+static __init int netfilter_log_sysctl_init(void)
+{
+ return 0;
+}
+#endif /* CONFIG_SYSCTL */
int __init netfilter_log_init(void)
{
+ int i, r;
#ifdef CONFIG_PROC_FS
- struct proc_dir_entry *pde;
-
- pde = create_proc_entry("nf_log", S_IRUGO, proc_net_netfilter);
- if (!pde)
+ if (!proc_create("nf_log", S_IRUGO,
+ proc_net_netfilter, &nflog_file_ops))
return -1;
-
- pde->proc_fops = &nflog_file_ops;
#endif
+
+ /* Errors will trigger panic, unroll on error is unnecessary. */
+ r = netfilter_log_sysctl_init();
+ if (r < 0)
+ return r;
+
+ for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
+ INIT_LIST_HEAD(&(nf_loggers_l[i]));
+
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff