netfilter: nft_limit: allow to invert matching criteria

This patch allows you to invert the ratelimit matching criteria, so you
can match packets over the ratelimit. This is required to support what
hashlimit does.

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

1 files changed, 13 insertions, 3 deletions

diff --git a/net/netfilter/nft_limit.c b/net/netfilter/nft_limit.c
index 5d67938f8b2f..99d18578afc6 100644
--- a/net/netfilter/nft_limit.c
+++ b/net/netfilter/nft_limit.c
@@ -26,6 +26,7 @@ struct nft_limit {
         u64             rate;
         u64             nsecs;
         u32             burst;
+        bool            invert;
 };
 
 static inline bool nft_limit_eval(struct nft_limit *limit, u64 cost)
@@ -44,11 +45,11 @@ static inline bool nft_limit_eval(struct nft_limit *limit, u64 cost)
         if (delta >= 0) {
                 limit->tokens = delta;
                 spin_unlock_bh(&limit_lock);
-                return false;
+                return limit->invert;
         }
         limit->tokens = tokens;
         spin_unlock_bh(&limit_lock);
-        return true;
+        return !limit->invert;
 }
 
 static int nft_limit_init(struct nft_limit *limit,
@@ -78,6 +79,12 @@ static int nft_limit_init(struct nft_limit *limit,
 
                 limit->rate = rate;
         }
+        if (tb[NFTA_LIMIT_FLAGS]) {
+                u32 flags = ntohl(nla_get_be32(tb[NFTA_LIMIT_FLAGS]));
+
+                if (flags & NFT_LIMIT_F_INV)
+                        limit->invert = true;
+        }
         limit->last = ktime_get_ns();
 
         return 0;
@@ -86,13 +93,15 @@ static int nft_limit_init(struct nft_limit *limit,
 static int nft_limit_dump(struct sk_buff *skb, const struct nft_limit *limit,
                           enum nft_limit_type type)
 {
+        u32 flags = limit->invert ? NFT_LIMIT_F_INV : 0;
         u64 secs = div_u64(limit->nsecs, NSEC_PER_SEC);
         u64 rate = limit->rate - limit->burst;
 
         if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(rate)) ||
             nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(secs)) ||
             nla_put_be32(skb, NFTA_LIMIT_BURST, htonl(limit->burst)) ||
-            nla_put_be32(skb, NFTA_LIMIT_TYPE, htonl(type)))
+            nla_put_be32(skb, NFTA_LIMIT_TYPE, htonl(type)) ||
+            nla_put_be32(skb, NFTA_LIMIT_FLAGS, htonl(flags)))
                 goto nla_put_failure;
         return 0;
 
@@ -120,6 +129,7 @@ static const struct nla_policy nft_limit_policy[NFTA_LIMIT_MAX + 1] = {
         [NFTA_LIMIT_UNIT]       = { .type = NLA_U64 },
         [NFTA_LIMIT_BURST]      = { .type = NLA_U32 },
         [NFTA_LIMIT_TYPE]       = { .type = NLA_U32 },
+        [NFTA_LIMIT_FLAGS]      = { .type = NLA_U32 },
 };
 
 static int nft_limit_pkts_init(const struct nft_ctx *ctx,