netfilter: print the list of register loggers

This patch modifies the proc output to add display of registered
loggers. The content of /proc/net/netfilter/nf_log is modified. Instead
of displaying a protocol per line with format:
	proto:logger
it now displays:
	proto:logger (comma_separated_list_of_loggers)
NONE is used as keyword if no logger is used.

Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index a228b5f..4fcbcc7 100644 (file)
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -154,13 +154,37 @@ 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)
-               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 const struct seq_operations nflog_seq_ops = {