netfilter: nf_tables: add nft_set_elem_update_expr() helper function

This helper function runs the eval path of the stateful expression
of an existing set element.

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

diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 025ec14..5d80e09 100644 (file)
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -890,6 +890,18 @@ static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
        return (void *)&rule->data[rule->dlen];
 }
 
+static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
+                                           struct nft_regs *regs,
+                                           const struct nft_pktinfo *pkt)
+{
+       struct nft_expr *expr;
+
+       if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
+               expr = nft_set_ext_expr(ext);
+               expr->ops->eval(expr, regs, pkt);
+       }
+}
+
 /*
  * The last pointer isn't really necessary, but the compiler isn't able to
  * determine that the result of nft_expr_last() is always the same since it

diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index e106cf1..46ab28e 100644 (file)
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -81,7 +81,6 @@ void nft_dynset_eval(const struct nft_expr *expr,
        const struct nft_dynset *priv = nft_expr_priv(expr);
        struct nft_set *set = priv->set;
        const struct nft_set_ext *ext;
-       const struct nft_expr *sexpr;
        u64 timeout;
 
        if (priv->op == NFT_DYNSET_OP_DELETE) {
@@ -91,18 +90,13 @@ void nft_dynset_eval(const struct nft_expr *expr,
 
        if (set->ops->update(set, &regs->data[priv->sreg_key], nft_dynset_new,
                             expr, regs, &ext)) {
-               sexpr = NULL;
-               if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
-                       sexpr = nft_set_ext_expr(ext);
-
                if (priv->op == NFT_DYNSET_OP_UPDATE &&
                    nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
                        timeout = priv->timeout ? : set->timeout;
                        *nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
                }
 
-               if (sexpr != NULL)
-                       sexpr->ops->eval(sexpr, regs, pkt);
+               nft_set_elem_update_expr(ext, regs, pkt);
 
                if (priv->invert)
                        regs->verdict.code = NFT_BREAK;