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Date: Sat, 22 Apr 2023 01:50:11 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org,
pabeni@...hat.com, edumazet@...gle.com
Subject: [PATCH net-next 09/19] netfilter: nf_tables: do not store rule in traceinfo structure
From: Florian Westphal <fw@...len.de>
pass it as argument instead. This reduces size of traceinfo to
16 bytes. Total stack usage:
nf_tables_core.c:252 nft_do_chain 304 static
While its possible to also pass basechain as argument, doing so
increases nft_do_chaininfo function size.
Unlike pktinfo/verdict/rule the basechain info isn't used in
the expression evaluation path. gcc places it on the stack, which
results in extra push/pop when it gets passed to the trace helpers
as argument rather than as part of the traceinfo structure.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables.h | 3 +--
net/netfilter/nf_tables_core.c | 15 +++++++--------
net/netfilter/nf_tables_trace.c | 14 ++++++++------
3 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 693469ecfa54..58a4d217faaf 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1409,7 +1409,6 @@ void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
* @skbid: hash of skb to be used as trace id
* @packet_dumped: packet headers sent in a previous traceinfo message
* @basechain: base chain currently processed
- * @rule: rule that was evaluated
*/
struct nft_traceinfo {
bool trace;
@@ -1418,7 +1417,6 @@ struct nft_traceinfo {
enum nft_trace_types type:8;
u32 skbid;
const struct nft_base_chain *basechain;
- const struct nft_rule_dp *rule;
};
void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
@@ -1426,6 +1424,7 @@ void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
void nft_trace_notify(const struct nft_pktinfo *pkt,
const struct nft_verdict *verdict,
+ const struct nft_rule_dp *rule,
struct nft_traceinfo *info);
#define MODULE_ALIAS_NFT_CHAIN(family, name) \
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 6debe8b2623f..4d0ce12221f6 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -43,6 +43,7 @@ static inline void nf_skip_indirect_calls_enable(void) { }
static noinline void __nft_trace_packet(const struct nft_pktinfo *pkt,
const struct nft_verdict *verdict,
+ const struct nft_rule_dp *rule,
struct nft_traceinfo *info,
enum nft_trace_types type)
{
@@ -51,7 +52,7 @@ static noinline void __nft_trace_packet(const struct nft_pktinfo *pkt,
info->type = type;
- nft_trace_notify(pkt, verdict, info);
+ nft_trace_notify(pkt, verdict, rule, info);
}
static inline void nft_trace_packet(const struct nft_pktinfo *pkt,
@@ -62,8 +63,7 @@ static inline void nft_trace_packet(const struct nft_pktinfo *pkt,
{
if (static_branch_unlikely(&nft_trace_enabled)) {
info->nf_trace = pkt->skb->nf_trace;
- info->rule = rule;
- __nft_trace_packet(pkt, verdict, info, type);
+ __nft_trace_packet(pkt, verdict, rule, info, type);
}
}
@@ -110,6 +110,7 @@ static void nft_cmp16_fast_eval(const struct nft_expr *expr,
static noinline void __nft_trace_verdict(const struct nft_pktinfo *pkt,
struct nft_traceinfo *info,
+ const struct nft_rule_dp *rule,
const struct nft_regs *regs)
{
enum nft_trace_types type;
@@ -131,7 +132,7 @@ static noinline void __nft_trace_verdict(const struct nft_pktinfo *pkt,
break;
}
- __nft_trace_packet(pkt, ®s->verdict, info, type);
+ __nft_trace_packet(pkt, ®s->verdict, rule, info, type);
}
static inline void nft_trace_verdict(const struct nft_pktinfo *pkt,
@@ -139,10 +140,8 @@ static inline void nft_trace_verdict(const struct nft_pktinfo *pkt,
const struct nft_rule_dp *rule,
const struct nft_regs *regs)
{
- if (static_branch_unlikely(&nft_trace_enabled)) {
- info->rule = rule;
- __nft_trace_verdict(pkt, info, regs);
- }
+ if (static_branch_unlikely(&nft_trace_enabled))
+ __nft_trace_verdict(pkt, info, rule, regs);
}
static bool nft_payload_fast_eval(const struct nft_expr *expr,
diff --git a/net/netfilter/nf_tables_trace.c b/net/netfilter/nf_tables_trace.c
index e635104a42be..6d41c0bd3d78 100644
--- a/net/netfilter/nf_tables_trace.c
+++ b/net/netfilter/nf_tables_trace.c
@@ -125,9 +125,10 @@ static int nf_trace_fill_pkt_info(struct sk_buff *nlskb,
static int nf_trace_fill_rule_info(struct sk_buff *nlskb,
const struct nft_verdict *verdict,
+ const struct nft_rule_dp *rule,
const struct nft_traceinfo *info)
{
- if (!info->rule || info->rule->is_last)
+ if (!rule || rule->is_last)
return 0;
/* a continue verdict with ->type == RETURN means that this is
@@ -140,7 +141,7 @@ static int nf_trace_fill_rule_info(struct sk_buff *nlskb,
return 0;
return nla_put_be64(nlskb, NFTA_TRACE_RULE_HANDLE,
- cpu_to_be64(info->rule->handle),
+ cpu_to_be64(rule->handle),
NFTA_TRACE_PAD);
}
@@ -166,9 +167,9 @@ static bool nft_trace_have_verdict_chain(const struct nft_verdict *verdict,
return true;
}
-static const struct nft_chain *nft_trace_get_chain(const struct nft_traceinfo *info)
+static const struct nft_chain *nft_trace_get_chain(const struct nft_rule_dp *rule,
+ const struct nft_traceinfo *info)
{
- const struct nft_rule_dp *rule = info->rule;
const struct nft_rule_dp_last *last;
if (!rule)
@@ -187,6 +188,7 @@ static const struct nft_chain *nft_trace_get_chain(const struct nft_traceinfo *i
void nft_trace_notify(const struct nft_pktinfo *pkt,
const struct nft_verdict *verdict,
+ const struct nft_rule_dp *rule,
struct nft_traceinfo *info)
{
const struct nft_chain *chain;
@@ -199,7 +201,7 @@ void nft_trace_notify(const struct nft_pktinfo *pkt,
if (!nfnetlink_has_listeners(nft_net(pkt), NFNLGRP_NFTRACE))
return;
- chain = nft_trace_get_chain(info);
+ chain = nft_trace_get_chain(rule, info);
size = nlmsg_total_size(sizeof(struct nfgenmsg)) +
nla_total_size(strlen(chain->table->name)) +
@@ -248,7 +250,7 @@ void nft_trace_notify(const struct nft_pktinfo *pkt,
if (nla_put_string(skb, NFTA_TRACE_TABLE, chain->table->name))
goto nla_put_failure;
- if (nf_trace_fill_rule_info(skb, verdict, info))
+ if (nf_trace_fill_rule_info(skb, verdict, rule, info))
goto nla_put_failure;
switch (info->type) {
--
2.30.2
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