[PATCH net-next 6/7] netfilter: nf_conntrack_expect: store event cache in expectation
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2026-07-24 10:49:50
Also in:
netfilter-devel
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Store the event cache in the expectation instead of accessing the exp->master cache, as a step forward towards turning the exp->master into a cookie. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- include/net/netfilter/nf_conntrack_expect.h | 3 +++ net/netfilter/nf_conntrack_broadcast.c | 6 ++++++ net/netfilter/nf_conntrack_ecache.c | 7 +------ net/netfilter/nf_conntrack_expect.c | 5 +++++ net/netfilter/nf_conntrack_netlink.c | 5 +++++ 5 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index c024345c9bd8..5d0f5b2f12a7 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h@@ -42,6 +42,9 @@ struct nf_conntrack_expect { /* Expectation class */ unsigned int class; + /* Event filter mask */ + u16 event_mask; + /* Function to call after setup and insertion */ void (*expectfn)(struct nf_conn *new, struct nf_conntrack_expect *this);
diff --git a/net/netfilter/nf_conntrack_broadcast.c b/net/netfilter/nf_conntrack_broadcast.c
index 6ff954f1bfb8..0922e30b6ab0 100644
--- a/net/netfilter/nf_conntrack_broadcast.c
+++ b/net/netfilter/nf_conntrack_broadcast.c@@ -14,6 +14,7 @@ #include <net/netfilter/nf_conntrack.h> #include <net/netfilter/nf_conntrack_helper.h> #include <net/netfilter/nf_conntrack_expect.h> +#include <net/netfilter/nf_conntrack_ecache.h> int nf_conntrack_broadcast_help(struct sk_buff *skb, struct nf_conn *ct,
@@ -27,6 +28,7 @@ int nf_conntrack_broadcast_help(struct sk_buff *skb, struct rtable *rt = skb_rtable(skb); struct in_device *in_dev; struct nf_conn_help *help = nfct_help(ct); + struct nf_conntrack_ecache *ecache; __be32 mask = 0; if (!help)
@@ -79,6 +81,10 @@ int nf_conntrack_broadcast_help(struct sk_buff *skb, #ifdef CONFIG_NF_CONNTRACK_ZONES exp->zone = ct->zone; #endif + ecache = nf_ct_ecache_find(ct); + if (ecache) + exp->event_mask = ecache->expmask; + nf_ct_expect_related(exp, 0); nf_ct_expect_put(exp);
diff --git a/net/netfilter/nf_conntrack_ecache.c b/net/netfilter/nf_conntrack_ecache.c
index cc8d8e85169f..fb731ee235d8 100644
--- a/net/netfilter/nf_conntrack_ecache.c
+++ b/net/netfilter/nf_conntrack_ecache.c@@ -245,7 +245,6 @@ void nf_ct_expect_event_report(enum ip_conntrack_expect_events event, { struct net *net = nf_ct_exp_net(exp); struct nf_ct_event_notifier *notify; - struct nf_conntrack_ecache *e; lockdep_nfct_expect_lock_held();
@@ -254,11 +253,7 @@ void nf_ct_expect_event_report(enum ip_conntrack_expect_events event, if (!notify) goto out_unlock; - e = nf_ct_ecache_find(exp->master); - if (!e) - goto out_unlock; - - if (e->expmask & (1 << event)) { + if (exp->event_mask & (1 << event)) { struct nf_exp_event item = { .exp = exp, .portid = portid,
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 7ae68d60586a..cd9af3620af5 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c@@ -330,6 +330,7 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class, struct nf_conntrack_helper *helper = NULL; struct nf_conn *ct = exp->master; struct net *net = read_pnet(&ct->ct_net); + struct nf_conntrack_ecache *ecache; struct nf_conn_help *help; int len;
@@ -342,6 +343,10 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class, exp->class = class; exp->expectfn = NULL; + ecache = nf_ct_ecache_find(ct); + if (ecache) + exp->event_mask = ecache->expmask; + help = nfct_help(ct); if (help) helper = rcu_dereference(help->helper);
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 31cbb1b55b9e..fc3f60099af3 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c@@ -3524,6 +3524,7 @@ ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct, { struct net *net = read_pnet(&ct->ct_net); struct nf_conntrack_helper *helper; + struct nf_conntrack_ecache *ecache; struct nf_conntrack_expect *exp; struct nf_conn_help *help; u32 class = 0;
@@ -3575,6 +3576,10 @@ ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct, exp->mask.src.u3 = mask->src.u3; exp->mask.src.u.all = mask->src.u.all; + ecache = nf_ct_ecache_find(ct); + if (ecache) + exp->event_mask = ecache->expmask; + if (cda[CTA_EXPECT_NAT]) { err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT], exp, nf_ct_l3num(ct));
--
2.47.3