1 files changed, 279 insertions, 53 deletions

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index bc11d709203..85296d4eac0 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -14,66 +14,123 @@
    LOG target modules */
 
 #define NF_LOG_PREFIXLEN		128
+#define NFLOGGER_NAME_LEN		64
 
-static const struct nf_logger *nf_loggers[NPROTO] __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, const struct nf_logger *logger)
+static struct nf_logger *__find_logger(int pf, const char *str_logger)
 {
-	int ret;
+	struct nf_logger *t;
 
-	if (pf >= NPROTO)
-		return -EINVAL;
+	list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
+		if (!strnicmp(str_logger, t->name, strlen(t->name)))
+			return t;
+	}
 
-	/* Any setup of logging members must be done before
-	 * substituting pointer. */
-	ret = mutex_lock_interruptible(&nf_log_mutex);
-	if (ret < 0)
-		return ret;
+	return NULL;
+}
 
-	if (!nf_loggers[pf])
-		rcu_assign_pointer(nf_loggers[pf], logger);
-	else if (nf_loggers[pf] == logger)
-		ret = -EEXIST;
-	else
-		ret = -EBUSY;
+void nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger)
+{
+	const struct nf_logger *log;
+
+	if (pf == NFPROTO_UNSPEC)
+		return;
+
+	mutex_lock(&nf_log_mutex);
+	log = rcu_dereference_protected(net->nf.nf_loggers[pf],
+					lockdep_is_held(&nf_log_mutex));
+	if (log == NULL)
+		rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
 
 	mutex_unlock(&nf_log_mutex);
-	return ret;
 }
-EXPORT_SYMBOL(nf_log_register);
+EXPORT_SYMBOL(nf_log_set);
 
-void nf_log_unregister_pf(int pf)
+void nf_log_unset(struct net *net, const struct nf_logger *logger)
 {
-	if (pf >= NPROTO)
-		return;
+	int i;
+	const struct nf_logger *log;
+
 	mutex_lock(&nf_log_mutex);
-	rcu_assign_pointer(nf_loggers[pf], NULL);
+	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
+		log = rcu_dereference_protected(net->nf.nf_loggers[i],
+				lockdep_is_held(&nf_log_mutex));
+		if (log == logger)
+			RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
+	}
 	mutex_unlock(&nf_log_mutex);
-
-	/* Give time to concurrent readers. */
 	synchronize_rcu();
 }
-EXPORT_SYMBOL(nf_log_unregister_pf);
+EXPORT_SYMBOL(nf_log_unset);
 
-void nf_log_unregister(const struct nf_logger *logger)
+/* return EEXIST if the same logger is registered, 0 on success. */
+int nf_log_register(u_int8_t pf, struct nf_logger *logger)
 {
 	int i;
 
+	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(logger->list); i++)
+		INIT_LIST_HEAD(&logger->list[i]);
+
 	mutex_lock(&nf_log_mutex);
-	for (i = 0; i < NPROTO; i++) {
-		if (nf_loggers[i] == logger)
-			rcu_assign_pointer(nf_loggers[i], 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]);
 	}
+
 	mutex_unlock(&nf_log_mutex);
 
-	synchronize_rcu();
+	return 0;
+}
+EXPORT_SYMBOL(nf_log_register);
+
+void nf_log_unregister(struct nf_logger *logger)
+{
+	int i;
+
+	mutex_lock(&nf_log_mutex);
+	for (i = 0; i < NFPROTO_NUMPROTO; i++)
+		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(struct net *net, u_int8_t pf,
+		   const struct nf_logger *logger)
+{
+	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
+		return -EINVAL;
+	mutex_lock(&nf_log_mutex);
+	if (__find_logger(pf, logger->name) == NULL) {
+		mutex_unlock(&nf_log_mutex);
+		return -ENOENT;
+	}
+	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
+	mutex_unlock(&nf_log_mutex);
+	return 0;
+}
+EXPORT_SYMBOL(nf_log_bind_pf);
+
+void nf_log_unbind_pf(struct net *net, u_int8_t pf)
+{
+	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
+		return;
+	mutex_lock(&nf_log_mutex);
+	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
+	mutex_unlock(&nf_log_mutex);
+}
+EXPORT_SYMBOL(nf_log_unbind_pf);
+
+void nf_log_packet(struct net *net,
+		   u_int8_t pf,
 		   unsigned int hooknum,
 		   const struct sk_buff *skb,
 		   const struct net_device *in,
@@ -86,16 +143,12 @@ void nf_log_packet(int pf,
 	const struct nf_logger *logger;
 
 	rcu_read_lock();
-	logger = rcu_dereference(nf_loggers[pf]);
+	logger = rcu_dereference(net->nf.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);
-	} 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");
+		logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
 	}
 	rcu_read_unlock();
 }
@@ -103,11 +156,12 @@ 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();
+	struct net *net = seq_file_net(seq);
+
+	mutex_lock(&nf_log_mutex);
 
-	if (*pos >= NPROTO)
+	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
 		return NULL;
 
 	return pos;
@@ -115,31 +169,52 @@ static void *seq_start(struct seq_file *seq, loff_t *pos)
 
 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
+	struct net *net = seq_file_net(s);
+
 	(*pos)++;
 
-	if (*pos >= NPROTO)
+	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
 		return NULL;
 
 	return pos;
 }
 
 static void seq_stop(struct seq_file *s, void *v)
-	__releases(RCU)
 {
-	rcu_read_unlock();
+	mutex_unlock(&nf_log_mutex);
 }
 
 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;
+	struct net *net = seq_file_net(s);
 
-	logger = rcu_dereference(nf_loggers[*pos]);
+	logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
+					   lockdep_is_held(&nf_log_mutex));
 
 	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);
 
-	return seq_printf(s, "%2lld %s\n", *pos, logger->name);
+	if (ret < 0)
+		return ret;
+
+	list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
+		ret = seq_printf(s, "%s", t->name);
+		if (ret < 0)
+			return ret;
+		if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
+			ret = seq_printf(s, ",");
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return seq_printf(s, ")\n");
 }
 
 static const struct seq_operations nflog_seq_ops = {
@@ -151,7 +226,8 @@ static const struct seq_operations nflog_seq_ops = {
 
 static int nflog_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &nflog_seq_ops);
+	return seq_open_net(inode, file, &nflog_seq_ops,
+			    sizeof(struct seq_net_private));
 }
 
 static const struct file_operations nflog_file_ops = {
@@ -159,18 +235,168 @@ static const struct file_operations nflog_file_ops = {
 	.open	 = nflog_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
-	.release = seq_release,
+	.release = seq_release_net,
 };
 
+
 #endif /* PROC_FS */
 
+#ifdef CONFIG_SYSCTL
+static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
+static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
 
-int __init netfilter_log_init(void)
+static int nf_log_proc_dostring(struct 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;
+	struct net *net = current->nsproxy->net_ns;
+
+	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(net, 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(net->nf.nf_loggers[tindex], logger);
+		mutex_unlock(&nf_log_mutex);
+	} else {
+		mutex_lock(&nf_log_mutex);
+		logger = rcu_dereference_protected(net->nf.nf_loggers[tindex],
+						   lockdep_is_held(&nf_log_mutex));
+		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 int netfilter_log_sysctl_init(struct net *net)
+{
+	int i;
+	struct ctl_table *table;
+
+	table = nf_log_sysctl_table;
+	if (!net_eq(net, &init_net)) {
+		table = kmemdup(nf_log_sysctl_table,
+				 sizeof(nf_log_sysctl_table),
+				 GFP_KERNEL);
+		if (!table)
+			goto err_alloc;
+	} else {
+		for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
+			snprintf(nf_log_sysctl_fnames[i],
+				 3, "%d", i);
+			nf_log_sysctl_table[i].procname	=
+				nf_log_sysctl_fnames[i];
+			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;
+		}
+	}
+
+	net->nf.nf_log_dir_header = register_net_sysctl(net,
+						"net/netfilter/nf_log",
+						table);
+	if (!net->nf.nf_log_dir_header)
+		goto err_reg;
+
+	return 0;
+
+err_reg:
+	if (!net_eq(net, &init_net))
+		kfree(table);
+err_alloc:
+	return -ENOMEM;
+}
+
+static void netfilter_log_sysctl_exit(struct net *net)
+{
+	struct ctl_table *table;
+
+	table = net->nf.nf_log_dir_header->ctl_table_arg;
+	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
+	if (!net_eq(net, &init_net))
+		kfree(table);
+}
+#else
+static int netfilter_log_sysctl_init(struct net *net)
+{
+	return 0;
+}
+
+static void netfilter_log_sysctl_exit(struct net *net)
 {
+}
+#endif /* CONFIG_SYSCTL */
+
+static int __net_init nf_log_net_init(struct net *net)
+{
+	int ret = -ENOMEM;
+
 #ifdef CONFIG_PROC_FS
 	if (!proc_create("nf_log", S_IRUGO,
-			 proc_net_netfilter, &nflog_file_ops))
-		return -1;
+			 net->nf.proc_netfilter, &nflog_file_ops))
+		return ret;
+#endif
+	ret = netfilter_log_sysctl_init(net);
+	if (ret < 0)
+		goto out_sysctl;
+
+	return 0;
+
+out_sysctl:
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("nf_log", net->nf.proc_netfilter);
+#endif
+	return ret;
+}
+
+static void __net_exit nf_log_net_exit(struct net *net)
+{
+	netfilter_log_sysctl_exit(net);
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("nf_log", net->nf.proc_netfilter);
 #endif
+}
+
+static struct pernet_operations nf_log_net_ops = {
+	.init = nf_log_net_init,
+	.exit = nf_log_net_exit,
+};
+
+int __init netfilter_log_init(void)
+{
+	int i, ret;
+
+	ret = register_pernet_subsys(&nf_log_net_ops);
+	if (ret < 0)
+		return ret;
+
+	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
+		INIT_LIST_HEAD(&(nf_loggers_l[i]));
+
 	return 0;
 }