From 0cebe4b4163b6373c9d24c1a192939777bc27e55 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 3 Feb 2010 13:51:51 +0100 Subject: netfilter: ctnetlink: support selective event delivery Add two masks for conntrack end expectation events to struct nf_conntrack_ecache and use them to filter events. Their default value is "all events" when the event sysctl is on and "no events" when it is off. A following patch will add specific initializations. Expectation events depend on the ecache struct of their master conntrack. Signed-off-by: Patrick McHardy --- include/net/netfilter/nf_conntrack_ecache.h | 59 ++++++++++++++--------------- 1 file changed, 28 insertions(+), 31 deletions(-) (limited to 'include/net') diff --git a/include/net/netfilter/nf_conntrack_ecache.h b/include/net/netfilter/nf_conntrack_ecache.h index 5e05fb883ab1..96ba5f7dcab6 100644 --- a/include/net/netfilter/nf_conntrack_ecache.h +++ b/include/net/netfilter/nf_conntrack_ecache.h @@ -12,28 +12,12 @@ #include #include -/* Connection tracking event types */ -enum ip_conntrack_events { - IPCT_NEW, /* new conntrack */ - IPCT_RELATED, /* related conntrack */ - IPCT_DESTROY, /* destroyed conntrack */ - IPCT_REPLY, /* connection has seen two-way traffic */ - IPCT_ASSURED, /* connection status has changed to assured */ - IPCT_PROTOINFO, /* protocol information has changed */ - IPCT_HELPER, /* new helper has been set */ - IPCT_MARK, /* new mark has been set */ - IPCT_NATSEQADJ, /* NAT is doing sequence adjustment */ - IPCT_SECMARK, /* new security mark has been set */ -}; - -enum ip_conntrack_expect_events { - IPEXP_NEW, /* new expectation */ -}; - struct nf_conntrack_ecache { - unsigned long cache; /* bitops want long */ - unsigned long missed; /* missed events */ - u32 pid; /* netlink pid of destroyer */ + unsigned long cache; /* bitops want long */ + unsigned long missed; /* missed events */ + u16 ctmask; /* bitmask of ct events to be delivered */ + u16 expmask; /* bitmask of expect events to be delivered */ + u32 pid; /* netlink pid of destroyer */ }; static inline struct nf_conntrack_ecache * @@ -43,14 +27,24 @@ nf_ct_ecache_find(const struct nf_conn *ct) } static inline struct nf_conntrack_ecache * -nf_ct_ecache_ext_add(struct nf_conn *ct, gfp_t gfp) +nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp) { struct net *net = nf_ct_net(ct); + struct nf_conntrack_ecache *e; - if (!net->ct.sysctl_events) + if (!ctmask && !expmask && net->ct.sysctl_events) { + ctmask = ~0; + expmask = ~0; + } + if (!ctmask && !expmask) return NULL; - return nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp); + e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp); + if (e) { + e->ctmask = ctmask; + e->expmask = expmask; + } + return e; }; #ifdef CONFIG_NF_CONNTRACK_EVENTS @@ -83,6 +77,9 @@ nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct) if (e == NULL) return; + if (!(e->ctmask & (1 << event))) + return; + set_bit(event, &e->cache); } @@ -93,7 +90,6 @@ nf_conntrack_eventmask_report(unsigned int eventmask, int report) { int ret = 0; - struct net *net = nf_ct_net(ct); struct nf_ct_event_notifier *notify; struct nf_conntrack_ecache *e; @@ -102,9 +98,6 @@ nf_conntrack_eventmask_report(unsigned int eventmask, if (notify == NULL) goto out_unlock; - if (!net->ct.sysctl_events) - goto out_unlock; - e = nf_ct_ecache_find(ct); if (e == NULL) goto out_unlock; @@ -118,6 +111,9 @@ nf_conntrack_eventmask_report(unsigned int eventmask, /* This is a resent of a destroy event? If so, skip missed */ unsigned long missed = e->pid ? 0 : e->missed; + if (!((eventmask | missed) & e->ctmask)) + goto out_unlock; + ret = notify->fcn(eventmask | missed, &item); if (unlikely(ret < 0 || missed)) { spin_lock_bh(&ct->lock); @@ -173,18 +169,19 @@ nf_ct_expect_event_report(enum ip_conntrack_expect_events event, u32 pid, int report) { - struct net *net = nf_ct_exp_net(exp); struct nf_exp_event_notifier *notify; + struct nf_conntrack_ecache *e; rcu_read_lock(); notify = rcu_dereference(nf_expect_event_cb); if (notify == NULL) goto out_unlock; - if (!net->ct.sysctl_events) + e = nf_ct_ecache_find(exp->master); + if (e == NULL) goto out_unlock; - { + if (e->expmask & (1 << event)) { struct nf_exp_event item = { .exp = exp, .pid = pid, -- cgit v1.2.2