From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 21/27] netfilter: reduce direct skb->nfct usage
Date: Fri, 3 Feb 2017 13:25:32 +0100 [thread overview]
Message-ID: <1486124738-3013-22-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1486124738-3013-1-git-send-email-pablo@netfilter.org>
From: Florian Westphal <fw@strlen.de>
Next patch makes direct skb->nfct access illegal, reduce noise
in next patch by using accessors we already have.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/ip_vs.h | 9 ++++++---
net/netfilter/nf_conntrack_core.c | 15 +++++++++------
2 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index cd6018a9ee24..2a344ebd7ebe 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -1554,10 +1554,13 @@ static inline void ip_vs_notrack(struct sk_buff *skb)
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
if (!ct || !nf_ct_is_untracked(ct)) {
- nf_conntrack_put(skb->nfct);
- skb->nfct = &nf_ct_untracked_get()->ct_general;
+ struct nf_conn *untracked;
+
+ nf_conntrack_put(&ct->ct_general);
+ untracked = nf_ct_untracked_get();
+ nf_conntrack_get(&untracked->ct_general);
+ skb->nfct = &untracked->ct_general;
skb->nfctinfo = IP_CT_NEW;
- nf_conntrack_get(skb->nfct);
}
#endif
}
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 86186a2e2715..adb7af3a4c4c 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -686,8 +686,11 @@ static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb,
!nfct_nat(ct) &&
!nf_ct_is_dying(ct) &&
atomic_inc_not_zero(&ct->ct_general.use)) {
- nf_ct_acct_merge(ct, ctinfo, (struct nf_conn *)skb->nfct);
- nf_conntrack_put(skb->nfct);
+ enum ip_conntrack_info oldinfo;
+ struct nf_conn *loser_ct = nf_ct_get(skb, &oldinfo);
+
+ nf_ct_acct_merge(ct, ctinfo, loser_ct);
+ nf_conntrack_put(&loser_ct->ct_general);
/* Assign conntrack already in hashes to this skbuff. Don't
* modify skb->nfctinfo to ensure consistent stateful filtering.
*/
@@ -1288,7 +1291,7 @@ unsigned int
nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
struct sk_buff *skb)
{
- struct nf_conn *ct, *tmpl = NULL;
+ struct nf_conn *ct, *tmpl;
enum ip_conntrack_info ctinfo;
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
@@ -1298,9 +1301,9 @@ nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
int set_reply = 0;
int ret;
- if (skb->nfct) {
+ tmpl = nf_ct_get(skb, &ctinfo);
+ if (tmpl) {
/* Previously seen (loopback or untracked)? Ignore. */
- tmpl = (struct nf_conn *)skb->nfct;
if (!nf_ct_is_template(tmpl)) {
NF_CT_STAT_INC_ATOMIC(net, ignore);
return NF_ACCEPT;
@@ -1364,7 +1367,7 @@ nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
/* Invalid: inverse of the return code tells
* the netfilter core what to do */
pr_debug("nf_conntrack_in: Can't track with proto module\n");
- nf_conntrack_put(skb->nfct);
+ nf_conntrack_put(&ct->ct_general);
skb->nfct = NULL;
NF_CT_STAT_INC_ATOMIC(net, invalid);
if (ret == -NF_DROP)
--
2.1.4
next prev parent reply other threads:[~2017-02-03 12:25 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-03 12:25 [PATCH 00/27] Netfilter updates for net-next Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 01/27] netfilter: merge udp and udplite conntrack helpers Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 02/27] netfilter: nat: merge udp and udplite helpers Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 03/27] netfilter: nf_tables: add missing descriptions in nft_ct_keys Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 04/27] netfilter: nft_ct: add average bytes per packet support Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 05/27] netfilter: select LIBCRC32C together with SCTP conntrack Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 06/27] netfilter: conntrack: validate SCTP crc32c in PREROUTING Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 07/27] netfilter: xt_connlimit: use rb_entry() Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 08/27] xtables: add xt_match, xt_target and data copy_to_user functions Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 09/27] iptables: use match, target and data copy_to_user helpers Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 10/27] ip6tables: " Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 11/27] arptables: " Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 12/27] ebtables: " Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 13/27] xtables: use match, target and data copy_to_user helpers in compat Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 14/27] xtables: extend matches and targets with .usersize Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 15/27] netfilter: pkttype: unnecessary to check ipv6 multicast address Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 16/27] netfilter: nft_meta: deal with PACKET_LOOPBACK in netdev family Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 17/27] netfilter: nf_tables: eliminate useless condition checks Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 18/27] netfilter: nf_tables: Eliminate duplicated code in nf_tables_table_enable() Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 19/27] netfilter: conntrack: no need to pass ctinfo to error handler Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 20/27] netfilter: reset netfilter state when duplicating packet Pablo Neira Ayuso
2017-02-03 12:25 ` Pablo Neira Ayuso [this message]
2017-02-03 12:25 ` [PATCH 22/27] skbuff: add and use skb_nfct helper Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 23/27] netfilter: add and use nf_ct_set helper Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 24/27] netfilter: guarantee 8 byte minalign for template addresses Pablo Neira Ayuso
2017-02-06 10:08 ` David Laight
2017-02-03 12:25 ` [PATCH 25/27] netfilter: merge ctinfo into nfct pointer storage area Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 26/27] ipvs: free ip_vs_dest structs when refcnt=0 Pablo Neira Ayuso
2017-02-03 12:25 ` [PATCH 27/27] netfilter: allow logging from non-init namespaces Pablo Neira Ayuso
2017-02-03 22:08 ` [PATCH 00/27] Netfilter updates for net-next David Miller
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