netfilter: implement hotdrop for Ebtables

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 10 insertions, 3 deletions

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index c4f7a2e8ed39..7964d3f03886 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -78,9 +78,10 @@ static inline int ebt_do_watcher (struct ebt_entry_watcher *w,
 
 static inline int ebt_do_match (struct ebt_entry_match *m,
    const struct sk_buff *skb, const struct net_device *in,
-   const struct net_device *out)
+   const struct net_device *out, bool *hotdrop)
 {
-        return m->u.match->match(skb, in, out, m->u.match, m->data, 0, 0, NULL);
+        return m->u.match->match(skb, in, out, m->u.match,
+               m->data, 0, 0, hotdrop);
 }
 
 static inline int ebt_dev_check(char *entry, const struct net_device *device)
@@ -156,6 +157,7 @@ unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
         struct ebt_entries *chaininfo;
         char *base;
         struct ebt_table_info *private;
+        bool hotdrop = false;
 
         read_lock_bh(&table->lock);
         private = table->private;
@@ -176,8 +178,13 @@ unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
                 if (ebt_basic_match(point, eth_hdr(skb), in, out))
                         goto letscontinue;
 
-                if (EBT_MATCH_ITERATE(point, ebt_do_match, skb, in, out) != 0)
+                if (EBT_MATCH_ITERATE(point, ebt_do_match, skb,
+                    in, out, &hotdrop) != 0)
                         goto letscontinue;
+                if (hotdrop) {
+                        read_unlock_bh(&table->lock);
+                        return NF_DROP;
+                }
 
                 /* increase counter */
                 (*(counter_base + i)).pcnt++;