![Adam Buchbinder](/assets/img/avatar_default.png)
Some comments misspell "registered"; this fixes them. No code changes. Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
312 lines
7.1 KiB
C
312 lines
7.1 KiB
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter.h>
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#include <linux/seq_file.h>
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#include <net/protocol.h>
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#include <net/netfilter/nf_log.h>
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#include "nf_internals.h"
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/* Internal logging interface, which relies on the real
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LOG target modules */
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#define NF_LOG_PREFIXLEN 128
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#define NFLOGGER_NAME_LEN 64
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static const struct nf_logger __rcu *nf_loggers[NFPROTO_NUMPROTO] __read_mostly;
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static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
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static DEFINE_MUTEX(nf_log_mutex);
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static struct nf_logger *__find_logger(int pf, const char *str_logger)
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{
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struct nf_logger *t;
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list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
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if (!strnicmp(str_logger, t->name, strlen(t->name)))
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return t;
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}
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return NULL;
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}
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/* return EEXIST if the same logger is registered, 0 on success. */
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int nf_log_register(u_int8_t pf, struct nf_logger *logger)
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{
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const struct nf_logger *llog;
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int i;
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if (pf >= ARRAY_SIZE(nf_loggers))
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(logger->list); i++)
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INIT_LIST_HEAD(&logger->list[i]);
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mutex_lock(&nf_log_mutex);
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if (pf == NFPROTO_UNSPEC) {
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for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
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list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
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} else {
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/* register at end of list to honor first register win */
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list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
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llog = rcu_dereference_protected(nf_loggers[pf],
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lockdep_is_held(&nf_log_mutex));
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if (llog == NULL)
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rcu_assign_pointer(nf_loggers[pf], logger);
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}
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mutex_unlock(&nf_log_mutex);
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return 0;
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}
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EXPORT_SYMBOL(nf_log_register);
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void nf_log_unregister(struct nf_logger *logger)
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{
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const struct nf_logger *c_logger;
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int i;
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mutex_lock(&nf_log_mutex);
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for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) {
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c_logger = rcu_dereference_protected(nf_loggers[i],
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lockdep_is_held(&nf_log_mutex));
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if (c_logger == logger)
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RCU_INIT_POINTER(nf_loggers[i], NULL);
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list_del(&logger->list[i]);
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}
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mutex_unlock(&nf_log_mutex);
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synchronize_rcu();
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}
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EXPORT_SYMBOL(nf_log_unregister);
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int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger)
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{
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if (pf >= ARRAY_SIZE(nf_loggers))
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return -EINVAL;
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mutex_lock(&nf_log_mutex);
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if (__find_logger(pf, logger->name) == NULL) {
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mutex_unlock(&nf_log_mutex);
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return -ENOENT;
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}
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rcu_assign_pointer(nf_loggers[pf], logger);
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mutex_unlock(&nf_log_mutex);
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return 0;
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}
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EXPORT_SYMBOL(nf_log_bind_pf);
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void nf_log_unbind_pf(u_int8_t pf)
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{
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if (pf >= ARRAY_SIZE(nf_loggers))
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return;
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mutex_lock(&nf_log_mutex);
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RCU_INIT_POINTER(nf_loggers[pf], NULL);
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mutex_unlock(&nf_log_mutex);
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}
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EXPORT_SYMBOL(nf_log_unbind_pf);
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void nf_log_packet(u_int8_t pf,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo,
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const char *fmt, ...)
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{
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va_list args;
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char prefix[NF_LOG_PREFIXLEN];
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const struct nf_logger *logger;
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rcu_read_lock();
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logger = rcu_dereference(nf_loggers[pf]);
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if (logger) {
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va_start(args, fmt);
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vsnprintf(prefix, sizeof(prefix), fmt, args);
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va_end(args);
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logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(nf_log_packet);
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#ifdef CONFIG_PROC_FS
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static void *seq_start(struct seq_file *seq, loff_t *pos)
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{
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mutex_lock(&nf_log_mutex);
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if (*pos >= ARRAY_SIZE(nf_loggers))
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return NULL;
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return pos;
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}
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static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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if (*pos >= ARRAY_SIZE(nf_loggers))
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return NULL;
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return pos;
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}
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static void seq_stop(struct seq_file *s, void *v)
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{
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mutex_unlock(&nf_log_mutex);
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}
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static int seq_show(struct seq_file *s, void *v)
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{
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loff_t *pos = v;
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const struct nf_logger *logger;
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struct nf_logger *t;
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int ret;
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logger = rcu_dereference_protected(nf_loggers[*pos],
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lockdep_is_held(&nf_log_mutex));
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if (!logger)
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ret = seq_printf(s, "%2lld NONE (", *pos);
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else
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ret = seq_printf(s, "%2lld %s (", *pos, logger->name);
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if (ret < 0)
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return ret;
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list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
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ret = seq_printf(s, "%s", t->name);
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if (ret < 0)
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return ret;
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if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
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ret = seq_printf(s, ",");
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if (ret < 0)
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return ret;
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}
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}
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return seq_printf(s, ")\n");
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}
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static const struct seq_operations nflog_seq_ops = {
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.start = seq_start,
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.next = seq_next,
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.stop = seq_stop,
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.show = seq_show,
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};
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static int nflog_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &nflog_seq_ops);
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}
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static const struct file_operations nflog_file_ops = {
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.owner = THIS_MODULE,
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.open = nflog_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif /* PROC_FS */
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#ifdef CONFIG_SYSCTL
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static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
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static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
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static struct ctl_table_header *nf_log_dir_header;
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static int nf_log_proc_dostring(ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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const struct nf_logger *logger;
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char buf[NFLOGGER_NAME_LEN];
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size_t size = *lenp;
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int r = 0;
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int tindex = (unsigned long)table->extra1;
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if (write) {
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if (size > sizeof(buf))
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size = sizeof(buf);
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if (copy_from_user(buf, buffer, size))
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return -EFAULT;
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if (!strcmp(buf, "NONE")) {
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nf_log_unbind_pf(tindex);
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return 0;
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}
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mutex_lock(&nf_log_mutex);
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logger = __find_logger(tindex, buf);
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if (logger == NULL) {
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mutex_unlock(&nf_log_mutex);
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return -ENOENT;
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}
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rcu_assign_pointer(nf_loggers[tindex], logger);
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mutex_unlock(&nf_log_mutex);
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} else {
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mutex_lock(&nf_log_mutex);
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logger = rcu_dereference_protected(nf_loggers[tindex],
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lockdep_is_held(&nf_log_mutex));
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if (!logger)
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table->data = "NONE";
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else
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table->data = logger->name;
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r = proc_dostring(table, write, buffer, lenp, ppos);
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mutex_unlock(&nf_log_mutex);
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}
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return r;
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}
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static __init int netfilter_log_sysctl_init(void)
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{
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int i;
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for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
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snprintf(nf_log_sysctl_fnames[i-NFPROTO_UNSPEC], 3, "%d", i);
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nf_log_sysctl_table[i].procname =
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nf_log_sysctl_fnames[i-NFPROTO_UNSPEC];
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nf_log_sysctl_table[i].data = NULL;
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nf_log_sysctl_table[i].maxlen =
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NFLOGGER_NAME_LEN * sizeof(char);
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nf_log_sysctl_table[i].mode = 0644;
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nf_log_sysctl_table[i].proc_handler = nf_log_proc_dostring;
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nf_log_sysctl_table[i].extra1 = (void *)(unsigned long) i;
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}
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nf_log_dir_header = register_net_sysctl(&init_net, "net/netfilter/nf_log",
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nf_log_sysctl_table);
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if (!nf_log_dir_header)
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return -ENOMEM;
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return 0;
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}
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#else
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static __init int netfilter_log_sysctl_init(void)
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{
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return 0;
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}
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#endif /* CONFIG_SYSCTL */
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int __init netfilter_log_init(void)
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{
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int i, r;
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#ifdef CONFIG_PROC_FS
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if (!proc_create("nf_log", S_IRUGO,
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proc_net_netfilter, &nflog_file_ops))
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return -1;
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#endif
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/* Errors will trigger panic, unroll on error is unnecessary. */
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r = netfilter_log_sysctl_init();
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if (r < 0)
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return r;
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for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
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INIT_LIST_HEAD(&(nf_loggers_l[i]));
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return 0;
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}
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