[NETFILTER]: Restore {ipt,ip6t,ebt}_LOG compatibility

The nfnetlink_log infrastructure changes broke compatiblity of the LOG
targets. They currently use whatever log backend was registered first,
which means that if ipt_ULOG was loaded first, no messages will be printed
to the ring buffer anymore.

Restore compatiblity by using the old log functions by default and only use
the nf_log backend if the user explicitly said so.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 23 insertions, 5 deletions

diff --git a/include/linux/netfilter_bridge/ebt_log.h b/include/linux/netfilter_bridge/ebt_log.h
index 358fbc84fb59..96e231ae7554 100644
--- a/include/linux/netfilter_bridge/ebt_log.h
+++ b/include/linux/netfilter_bridge/ebt_log.h
@@ -3,6 +3,7 @@
 
 #define EBT_LOG_IP 0x01 /* if the frame is made by ip, log the ip information */
 #define EBT_LOG_ARP 0x02
+#define EBT_LOG_NFLOG 0x04
 #define EBT_LOG_MASK (EBT_LOG_IP | EBT_LOG_ARP)
 #define EBT_LOG_PREFIX_SIZE 30
 #define EBT_LOG_WATCHER "log"
diff --git a/include/linux/netfilter_ipv4/ipt_LOG.h b/include/linux/netfilter_ipv4/ipt_LOG.h
index 22d16177319b..892f9a33fea8 100644
--- a/include/linux/netfilter_ipv4/ipt_LOG.h
+++ b/include/linux/netfilter_ipv4/ipt_LOG.h
@@ -6,7 +6,8 @@
 #define IPT_LOG_TCPOPT          0x02    /* Log TCP options */
 #define IPT_LOG_IPOPT           0x04    /* Log IP options */
 #define IPT_LOG_UID             0x08    /* Log UID owning local socket */
-#define IPT_LOG_MASK            0x0f
+#define IPT_LOG_NFLOG           0x10    /* Log using nf_log backend */
+#define IPT_LOG_MASK            0x1f
 
 struct ipt_log_info {
         unsigned char level;
diff --git a/include/linux/netfilter_ipv6/ip6t_LOG.h b/include/linux/netfilter_ipv6/ip6t_LOG.h
index 9008ff5c40ae..060c1a1c6c60 100644
--- a/include/linux/netfilter_ipv6/ip6t_LOG.h
+++ b/include/linux/netfilter_ipv6/ip6t_LOG.h
@@ -6,7 +6,8 @@
 #define IP6T_LOG_TCPOPT         0x02    /* Log TCP options */
 #define IP6T_LOG_IPOPT          0x04    /* Log IP options */
 #define IP6T_LOG_UID            0x08    /* Log UID owning local socket */
-#define IP6T_LOG_MASK           0x0f
+#define IP6T_LOG_NFLOG          0x10    /* Log using nf_log backend */
+#define IP6T_LOG_MASK           0x1f
 
 struct ip6t_log_info {
         unsigned char level;
diff --git a/net/bridge/netfilter/ebt_log.c b/net/bridge/netfilter/ebt_log.c
index 0128fbbe2328..288ff1d4ccc4 100644
--- a/net/bridge/netfilter/ebt_log.c
+++ b/net/bridge/netfilter/ebt_log.c
@@ -166,7 +166,12 @@ static void ebt_log(const struct sk_buff *skb, unsigned int hooknr,
         li.u.log.level = info->loglevel;
         li.u.log.logflags = info->bitmask;
 
-        nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li, info->prefix);
+        if (info->bitmask & EBT_LOG_NFLOG)
+                nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
+                              info->prefix);
+        else
+                ebt_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
+                               info->prefix);
 }
 
 static struct ebt_watcher log =
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
index 6606ddb66a29..cc27545ff97f 100644
--- a/net/ipv4/netfilter/ipt_LOG.c
+++ b/net/ipv4/netfilter/ipt_LOG.c
@@ -425,7 +425,12 @@ ipt_log_target(struct sk_buff **pskb,
         li.u.log.level = loginfo->level;
         li.u.log.logflags = loginfo->logflags;
 
-        nf_log_packet(PF_INET, hooknum, *pskb, in, out, &li, loginfo->prefix);
+        if (loginfo->logflags & IPT_LOG_NFLOG)
+                nf_log_packet(PF_INET, hooknum, *pskb, in, out, &li,
+                              loginfo->prefix);
+        else
+                ipt_log_packet(PF_INET, hooknum, *pskb, in, out, &li,
+                               loginfo->prefix);
 
         return IPT_CONTINUE;
 }
diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
index 77c725832dec..6b930efa9fb9 100644
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ b/net/ipv6/netfilter/ip6t_LOG.c
@@ -436,7 +436,12 @@ ip6t_log_target(struct sk_buff **pskb,
         li.u.log.level = loginfo->level;
         li.u.log.logflags = loginfo->logflags;
 
-        nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li, loginfo->prefix);
+        if (loginfo->logflags & IP6T_LOG_NFLOG)
+                nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
+                              loginfo->prefix);
+        else
+                ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
+                                loginfo->prefix);
 
         return IP6T_CONTINUE;
 }