netfilter: bridge: add generic packet logger

This adds the generic plain text packet loggger for bridged packets.
It routes the logging message to the real protocol packet logger.
I decided not to refactor the ebt_log code for two reasons:

1) The ebt_log output is not consistent with the IPv4 and IPv6
   Netfilter packet loggers. The output is different for no good
   reason and it adds redundant code to handle packet logging.

2) To avoid breaking backward compatibility for applications
   outthere that are parsing the specific ebt_log output, the ebt_log
   output has been left as is. So only nftables will use the new
   consistent logging format for logged bridged packets.

More decisions coming in this patch:

1) This also removes ebt_log as default logger for bridged packets.
   Thus, nf_log_packet() routes packet to this new packet logger
   instead. This doesn't break backward compatibility since
   nf_log_packet() is not used to log packets in plain text format
   from anywhere in the ebtables/netfilter bridge code.

2) The new bridge packet logger also performs a lazy request to
   register the real IPv4, ARP and IPv6 netfilter packet loggers.
   If the real protocol logger is no available (not compiled or the
   module is not available in the system, not packet logging happens.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 0b2161c689e0..daad6022c689 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -132,6 +132,13 @@ void nf_log_unbind_pf(struct net *net, u_int8_t pf)
 }
 EXPORT_SYMBOL(nf_log_unbind_pf);
 
+void nf_logger_request_module(int pf, enum nf_log_type type)
+{
+	if (loggers[pf][type] == NULL)
+		request_module("nf-logger-%u-%u", pf, type);
+}
+EXPORT_SYMBOL_GPL(nf_logger_request_module);
+
 int nf_logger_find_get(int pf, enum nf_log_type type)
 {
 	struct nf_logger *logger;