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authorHarald Welte <laforge@netfilter.org>2005-08-09 19:58:27 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 15:38:07 -0700
commit608c8e4f7b6e61cc783283e9dff8a465a5ad59bb (patch)
tree55ca8bed99789cd6af07f6cc6ee99b0cf718a611 /net/core
parent838ab6364956d9bdcefe84712de1621cf20a40b3 (diff)
[NETFILTER]: Extend netfilter logging API
This patch is in preparation to nfnetlink_log: - loggers now have to register struct nf_logger instead of nf_logfn - nf_log_unregister() replaced by nf_log_unregister_pf() and nf_log_unregister_logger() - add comment to ip[6]t_LOG.h to assure nobody redefines flags - add /proc/net/netfilter/nf_log to tell user which logger is currently registered for which address family - if user has configured logging, but no logging backend (logger) is available, always spit a message to syslog, not just the first time. - split ip[6]t_LOG.c into two parts: Backend: Always try to register as logger for the respective address family Frontend: Always log via nf_log_packet() API - modify all users of nf_log_packet() to accomodate additional argument Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/netfilter.c127
1 files changed, 110 insertions, 17 deletions
diff --git a/net/core/netfilter.c b/net/core/netfilter.c
index 3e38084ac2b..98cc61e79fe 100644
--- a/net/core/netfilter.c
+++ b/net/core/netfilter.c
@@ -22,6 +22,7 @@
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
+#include <linux/proc_fs.h>
#include <net/sock.h>
/* In this code, we can be waiting indefinitely for userspace to
@@ -535,11 +536,10 @@ EXPORT_SYMBOL(skb_make_writable);
#define NF_LOG_PREFIXLEN 128
-static nf_logfn *nf_logging[NPROTO]; /* = NULL */
-static int reported = 0;
+static struct nf_logger *nf_logging[NPROTO]; /* = NULL */
static DEFINE_SPINLOCK(nf_log_lock);
-int nf_log_register(int pf, nf_logfn *logfn)
+int nf_log_register(int pf, struct nf_logger *logger)
{
int ret = -EBUSY;
@@ -547,54 +547,134 @@ int nf_log_register(int pf, nf_logfn *logfn)
* substituting pointer. */
spin_lock(&nf_log_lock);
if (!nf_logging[pf]) {
- rcu_assign_pointer(nf_logging[pf], logfn);
+ rcu_assign_pointer(nf_logging[pf], logger);
ret = 0;
}
spin_unlock(&nf_log_lock);
return ret;
}
-void nf_log_unregister(int pf, nf_logfn *logfn)
+void nf_log_unregister_pf(int pf)
{
spin_lock(&nf_log_lock);
- if (nf_logging[pf] == logfn)
- nf_logging[pf] = NULL;
+ nf_logging[pf] = NULL;
spin_unlock(&nf_log_lock);
/* Give time to concurrent readers. */
synchronize_net();
-}
+}
+
+void nf_log_unregister_logger(struct nf_logger *logger)
+{
+ int i;
+
+ spin_lock(&nf_log_lock);
+ for (i = 0; i < NPROTO; i++) {
+ if (nf_logging[i] == logger)
+ nf_logging[i] = NULL;
+ }
+ spin_unlock(&nf_log_lock);
+
+ synchronize_net();
+}
void nf_log_packet(int pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
+ struct nf_loginfo *loginfo,
const char *fmt, ...)
{
va_list args;
char prefix[NF_LOG_PREFIXLEN];
- nf_logfn *logfn;
+ struct nf_logger *logger;
rcu_read_lock();
- logfn = rcu_dereference(nf_logging[pf]);
- if (logfn) {
+ logger = rcu_dereference(nf_logging[pf]);
+ if (logger) {
va_start(args, fmt);
vsnprintf(prefix, sizeof(prefix), fmt, args);
va_end(args);
/* We must read logging before nf_logfn[pf] */
- logfn(hooknum, skb, in, out, prefix);
- } else if (!reported) {
- printk(KERN_WARNING "nf_log_packet: can\'t log yet, "
- "no backend logging module loaded in!\n");
- reported++;
+ 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();
}
EXPORT_SYMBOL(nf_log_register);
-EXPORT_SYMBOL(nf_log_unregister);
+EXPORT_SYMBOL(nf_log_unregister_pf);
+EXPORT_SYMBOL(nf_log_unregister_logger);
EXPORT_SYMBOL(nf_log_packet);
+#ifdef CONFIG_PROC_FS
+struct proc_dir_entry *proc_net_netfilter;
+EXPORT_SYMBOL(proc_net_netfilter);
+
+static void *seq_start(struct seq_file *seq, loff_t *pos)
+{
+ rcu_read_lock();
+
+ if (*pos >= NPROTO)
+ return NULL;
+
+ return pos;
+}
+
+static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ (*pos)++;
+
+ if (*pos >= NPROTO)
+ return NULL;
+
+ return pos;
+}
+
+static void seq_stop(struct seq_file *s, void *v)
+{
+ rcu_read_unlock();
+}
+
+static int seq_show(struct seq_file *s, void *v)
+{
+ loff_t *pos = v;
+ const struct nf_logger *logger;
+
+ logger = rcu_dereference(nf_logging[*pos]);
+
+ if (!logger)
+ return seq_printf(s, "%2lld NONE\n", *pos);
+
+ return seq_printf(s, "%2lld %s\n", *pos, logger->name);
+}
+
+static 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 struct file_operations nflog_file_ops = {
+ .owner = THIS_MODULE,
+ .open = nflog_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#endif /* PROC_FS */
+
+
/* This does not belong here, but locally generated errors need it if connection
tracking in use: without this, connection may not be in hash table, and hence
manufactured ICMP or RST packets will not be associated with it. */
@@ -613,6 +693,9 @@ void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb)
void __init netfilter_init(void)
{
int i, h;
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *pde;
+#endif
queue_rerouter = kmalloc(NPROTO * sizeof(struct nf_queue_rerouter),
GFP_KERNEL);
@@ -624,6 +707,16 @@ void __init netfilter_init(void)
for (h = 0; h < NF_MAX_HOOKS; h++)
INIT_LIST_HEAD(&nf_hooks[i][h]);
}
+
+#ifdef CONFIG_PROC_FS
+ proc_net_netfilter = proc_mkdir("netfilter", proc_net);
+ if (!proc_net_netfilter)
+ panic("cannot create netfilter proc entry");
+ pde = create_proc_entry("nf_log", S_IRUGO, proc_net_netfilter);
+ if (!pde)
+ panic("cannot create /proc/net/netfilter/nf_log");
+ pde->proc_fops = &nflog_file_ops;
+#endif
}
EXPORT_SYMBOL(ip_ct_attach);