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netfilter: conntrack: simplify nf_conntrack_alter_reply

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nf_conntrack_alter_reply doesn't do helper reassignment anymore.
Remove the comments that make this claim.

Furthermore, remove dead code from the function and place ot
in nf_conntrack.h.

Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Florian Westphal 2023-10-06 11:27:29 +02:00
parent 99ab9f84b8
commit 8a23f4ab92
3 changed files with 11 additions and 28 deletions
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14
include/net/netfilter/nf_conntrack.h
View File

@ -160,10 +160,6 @@ static inline struct net *nf_ct_net(const struct nf_conn *ct)
return read_pnet(&ct->ct_net);
}
/* Alter reply tuple (maybe alter helper). */
void nf_conntrack_alter_reply(struct nf_conn *ct,
const struct nf_conntrack_tuple *newreply);
/* Is this tuple taken? (ignoring any belonging to the given
conntrack). */
int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
@ -284,6 +280,16 @@ static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
}
static inline void nf_conntrack_alter_reply(struct nf_conn *ct,
const struct nf_conntrack_tuple *newreply)
{
/* Must be unconfirmed, so not in hash table yet */
if (WARN_ON(nf_ct_is_confirmed(ct)))
return;
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
}
#define nfct_time_stamp ((u32)(jiffies))
/* jiffies until ct expires, 0 if already expired */

18
net/netfilter/nf_conntrack_core.c
View File

@ -2042,24 +2042,6 @@ out:
}
EXPORT_SYMBOL_GPL(nf_conntrack_in);
/* Alter reply tuple (maybe alter helper). This is for NAT, and is
implicitly racy: see __nf_conntrack_confirm */
void nf_conntrack_alter_reply(struct nf_conn *ct,
const struct nf_conntrack_tuple *newreply)
{
struct nf_conn_help *help = nfct_help(ct);
/* Should be unconfirmed, so not in hash table yet */
WARN_ON(nf_ct_is_confirmed(ct));
nf_ct_dump_tuple(newreply);
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (ct->master || (help && !hlist_empty(&help->expectations)))
return;
}
EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply);
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
void __nf_ct_refresh_acct(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,

7
net/netfilter/nf_conntrack_helper.c
View File

@ -194,12 +194,7 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
struct nf_conntrack_helper *helper = NULL;
struct nf_conn_help *help;
/* We already got a helper explicitly attached. The function
* nf_conntrack_alter_reply - in case NAT is in use - asks for looking
* the helper up again. Since now the user is in full control of
* making consistent helper configurations, skip this automatic
* re-lookup, otherwise we'll lose the helper.
*/
/* We already got a helper explicitly attached (e.g. nft_ct) */
if (test_bit(IPS_HELPER_BIT, &ct->status))
return 0;