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netfilter: nf_tables: handle meta/lookup with direct call 

Currently nft uses inlined variants for common operations
such as 'ip saddr 1.2.3.4' instead of an indirect call.

Also handle meta get operations and lookups without indirect call,
both are builtin.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-07-04 12:48:04 +02:00 committed by Pablo Neira Ayuso
parent ecbcd689d7
commit 222440b4e8
4 changed files with 28 additions and 7 deletions
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7
include/net/netfilter/nf_tables_core.h
View File

@ -71,4 +71,11 @@ extern struct nft_set_type nft_set_hash_fast_type;
extern struct nft_set_type nft_set_rbtree_type;
extern struct nft_set_type nft_set_bitmap_type;
struct nft_expr;
struct nft_regs;
struct nft_pktinfo;
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs, const struct nft_pktinfo *pkt);
void nft_lookup_eval(const struct nft_expr *expr,
struct nft_regs *regs, const struct nft_pktinfo *pkt);
#endif /* _NET_NF_TABLES_CORE_H */

16
net/netfilter/nf_tables_core.c
View File

@ -120,6 +120,20 @@ struct nft_jumpstack {
struct nft_rule *const *rules;
};
static void expr_call_ops_eval(const struct nft_expr *expr,
struct nft_regs *regs,
struct nft_pktinfo *pkt)
{
unsigned long e = (unsigned long)expr->ops->eval;
if (e == (unsigned long)nft_meta_get_eval)
nft_meta_get_eval(expr, regs, pkt);
else if (e == (unsigned long)nft_lookup_eval)
nft_lookup_eval(expr, regs, pkt);
else
expr->ops->eval(expr, regs, pkt);
}
unsigned int
nft_do_chain(struct nft_pktinfo *pkt, void *priv)
{
@ -153,7 +167,7 @@ next_rule:
nft_cmp_fast_eval(expr, &regs);
else if (expr->ops != &nft_payload_fast_ops ||
!nft_payload_fast_eval(expr, &regs, pkt))
expr->ops->eval(expr, &regs, pkt);
expr_call_ops_eval(expr, &regs, pkt);
if (regs.verdict.code != NFT_CONTINUE)
break;

6
net/netfilter/nft_lookup.c
View File

@ -26,9 +26,9 @@ struct nft_lookup {
struct nft_set_binding binding;
};
static void nft_lookup_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
void nft_lookup_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_lookup *priv = nft_expr_priv(expr);
const struct nft_set *set = priv->set;

6
net/netfilter/nft_meta.c
View File

@ -41,9 +41,9 @@ static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
#include "../bridge/br_private.h"
#endif
static void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_meta *priv = nft_expr_priv(expr);
const struct sk_buff *skb = pkt->skb;