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netfilter: ctnetlink: remove get_ct indirection

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Use nf_ct_get() directly, its a small inline helper without dependencies.

Add CONFIG_NF_CONNTRACK guards to elide the relevant part when conntrack
isn't available at all.

v2: add ifdef guard around nf_ct_get call (kernel test robot)
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2021-01-20 16:30:03 +01:00 committed by Pablo Neira Ayuso
parent a61e4b6076
commit 83ace77f51
4 changed files with 15 additions and 12 deletions
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2
include/linux/netfilter.h
View File

@ -463,8 +463,6 @@ extern struct nf_ct_hook __rcu *nf_ct_hook;
struct nlattr;
struct nfnl_ct_hook {
struct nf_conn *(*get_ct)(const struct sk_buff *skb,
enum ip_conntrack_info *ctinfo);
size_t (*build_size)(const struct nf_conn *ct);
int (*build)(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,

7
net/netfilter/nf_conntrack_netlink.c
View File

@ -2686,12 +2686,6 @@ ctnetlink_glue_build_size(const struct nf_conn *ct)
;
}
static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
enum ip_conntrack_info *ctinfo)
{
return nf_ct_get(skb, ctinfo);
}
static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
{
const struct nf_conntrack_zone *zone;
@ -2925,7 +2919,6 @@ static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
}
static struct nfnl_ct_hook ctnetlink_glue_hook = {
.get_ct = ctnetlink_glue_get_ct,
.build_size = ctnetlink_glue_build_size,
.build = ctnetlink_glue_build,
.parse = ctnetlink_glue_parse,

8
net/netfilter/nfnetlink_log.c
View File

@ -43,6 +43,10 @@
#include "../bridge/br_private.h"
#endif
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif
#define NFULNL_COPY_DISABLED 0xff
#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
#define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
@ -733,14 +737,16 @@ nfulnl_log_packet(struct net *net,
size += nla_total_size(sizeof(u_int32_t));
if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
size += nla_total_size(sizeof(u_int32_t));
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
if (inst->flags & NFULNL_CFG_F_CONNTRACK) {
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (nfnl_ct != NULL) {
ct = nfnl_ct->get_ct(skb, &ctinfo);
ct = nf_ct_get(skb, &ctinfo);
if (ct != NULL)
size += nfnl_ct->build_size(ct);
}
}
#endif
if (pf == NFPROTO_NETDEV || pf == NFPROTO_BRIDGE)
size += nfulnl_get_bridge_size(skb);

10
net/netfilter/nfnetlink_queue.c
View File

@ -444,13 +444,15 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
nfnl_ct = rcu_dereference(nfnl_ct_hook);
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
if (queue->flags & NFQA_CFG_F_CONNTRACK) {
if (nfnl_ct != NULL) {
ct = nfnl_ct->get_ct(entskb, &ctinfo);
ct = nf_ct_get(entskb, &ctinfo);
if (ct != NULL)
size += nfnl_ct->build_size(ct);
}
}
#endif
if (queue->flags & NFQA_CFG_F_UID_GID) {
size += (nla_total_size(sizeof(u_int32_t)) /* uid */
@ -1104,9 +1106,10 @@ static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
struct nf_queue_entry *entry,
enum ip_conntrack_info *ctinfo)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
struct nf_conn *ct;
ct = nfnl_ct->get_ct(entry->skb, ctinfo);
ct = nf_ct_get(entry->skb, ctinfo);
if (ct == NULL)
return NULL;
@ -1118,6 +1121,9 @@ static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
NETLINK_CB(entry->skb).portid,
nlmsg_report(nlh));
return ct;
#else
return NULL;
#endif
}
static int nfqa_parse_bridge(struct nf_queue_entry *entry,