8d65af789f
It's unused. It isn't needed -- read or write flag is already passed and sysctl shouldn't care about the rest. It _was_ used in two places at arch/frv for some reason. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
320 lines
7.2 KiB
C
320 lines
7.2 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/skbuff.h>
|
|
#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
|
|
LOG target modules */
|
|
|
|
#define NF_LOG_PREFIXLEN 128
|
|
#define NFLOGGER_NAME_LEN 64
|
|
|
|
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);
|
|
|
|
static struct nf_logger *__find_logger(int pf, const char *str_logger)
|
|
{
|
|
struct nf_logger *t;
|
|
|
|
list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
|
|
if (!strnicmp(str_logger, t->name, strlen(t->name)))
|
|
return t;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* return EEXIST if the same logger is registred, 0 on success. */
|
|
int nf_log_register(u_int8_t pf, struct nf_logger *logger)
|
|
{
|
|
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);
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
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 < 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);
|
|
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL(nf_log_unregister);
|
|
|
|
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,
|
|
const struct nf_loginfo *loginfo,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
char prefix[NF_LOG_PREFIXLEN];
|
|
const struct nf_logger *logger;
|
|
|
|
rcu_read_lock();
|
|
logger = rcu_dereference(nf_loggers[pf]);
|
|
if (logger) {
|
|
va_start(args, fmt);
|
|
vsnprintf(prefix, sizeof(prefix), fmt, args);
|
|
va_end(args);
|
|
logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(nf_log_packet);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static void *seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(RCU)
|
|
{
|
|
rcu_read_lock();
|
|
|
|
if (*pos >= ARRAY_SIZE(nf_loggers))
|
|
return NULL;
|
|
|
|
return pos;
|
|
}
|
|
|
|
static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
|
|
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();
|
|
}
|
|
|
|
static int seq_show(struct seq_file *s, void *v)
|
|
{
|
|
loff_t *pos = v;
|
|
const struct nf_logger *logger;
|
|
struct nf_logger *t;
|
|
int ret;
|
|
|
|
logger = rcu_dereference(nf_loggers[*pos]);
|
|
|
|
if (!logger)
|
|
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, ")\n");
|
|
}
|
|
|
|
static const struct seq_operations nflog_seq_ops = {
|
|
.start = seq_start,
|
|
.next = seq_next,
|
|
.stop = seq_stop,
|
|
.show = seq_show,
|
|
};
|
|
|
|
static int nflog_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &nflog_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations nflog_file_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = nflog_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.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
|
|
if (!proc_create("nf_log", S_IRUGO,
|
|
proc_net_netfilter, &nflog_file_ops))
|
|
return -1;
|
|
#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;
|
|
}
|