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- /*
- * connection tracking event cache.
- */
- #ifndef _NF_CONNTRACK_ECACHE_H
- #define _NF_CONNTRACK_ECACHE_H
- #include <net/netfilter/nf_conntrack.h>
- #include <net/net_namespace.h>
- #include <net/netfilter/nf_conntrack_expect.h>
- #include <linux/netfilter/nf_conntrack_common.h>
- #include <linux/netfilter/nf_conntrack_tuple_common.h>
- #include <net/netfilter/nf_conntrack_extend.h>
- struct nf_conntrack_ecache {
- 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 portid; /* netlink portid of destroyer */
- };
- static inline struct nf_conntrack_ecache *
- nf_ct_ecache_find(const struct nf_conn *ct)
- {
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
- #else
- return NULL;
- #endif
- }
- static inline struct nf_conntrack_ecache *
- nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
- {
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- struct net *net = nf_ct_net(ct);
- struct nf_conntrack_ecache *e;
- if (!ctmask && !expmask && net->ct.sysctl_events) {
- ctmask = ~0;
- expmask = ~0;
- }
- if (!ctmask && !expmask)
- return NULL;
- e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
- if (e) {
- e->ctmask = ctmask;
- e->expmask = expmask;
- }
- return e;
- #else
- return NULL;
- #endif
- };
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- /* This structure is passed to event handler */
- struct nf_ct_event {
- struct nf_conn *ct;
- u32 portid;
- int report;
- };
- struct nf_ct_event_notifier {
- int (*fcn)(unsigned int events, struct nf_ct_event *item);
- };
- int nf_conntrack_register_notifier(struct net *net,
- struct nf_ct_event_notifier *nb);
- void nf_conntrack_unregister_notifier(struct net *net,
- struct nf_ct_event_notifier *nb);
- void nf_ct_deliver_cached_events(struct nf_conn *ct);
- static inline void
- nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
- {
- struct net *net = nf_ct_net(ct);
- struct nf_conntrack_ecache *e;
- if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
- return;
- e = nf_ct_ecache_find(ct);
- if (e == NULL)
- return;
- set_bit(event, &e->cache);
- }
- static inline int
- nf_conntrack_eventmask_report(unsigned int eventmask,
- struct nf_conn *ct,
- u32 portid,
- int report)
- {
- int ret = 0;
- struct net *net = nf_ct_net(ct);
- struct nf_ct_event_notifier *notify;
- struct nf_conntrack_ecache *e;
- rcu_read_lock();
- notify = rcu_dereference(net->ct.nf_conntrack_event_cb);
- if (notify == NULL)
- goto out_unlock;
- e = nf_ct_ecache_find(ct);
- if (e == NULL)
- goto out_unlock;
- if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
- struct nf_ct_event item = {
- .ct = ct,
- .portid = e->portid ? e->portid : portid,
- .report = report
- };
- /* This is a resent of a destroy event? If so, skip missed */
- unsigned long missed = e->portid ? 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);
- if (ret < 0) {
- /* This is a destroy event that has been
- * triggered by a process, we store the PORTID
- * to include it in the retransmission. */
- if (eventmask & (1 << IPCT_DESTROY) &&
- e->portid == 0 && portid != 0)
- e->portid = portid;
- else
- e->missed |= eventmask;
- } else
- e->missed &= ~missed;
- spin_unlock_bh(&ct->lock);
- }
- }
- out_unlock:
- rcu_read_unlock();
- return ret;
- }
- static inline int
- nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
- u32 portid, int report)
- {
- return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
- }
- static inline int
- nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
- {
- return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
- }
- struct nf_exp_event {
- struct nf_conntrack_expect *exp;
- u32 portid;
- int report;
- };
- struct nf_exp_event_notifier {
- int (*fcn)(unsigned int events, struct nf_exp_event *item);
- };
- int nf_ct_expect_register_notifier(struct net *net,
- struct nf_exp_event_notifier *nb);
- void nf_ct_expect_unregister_notifier(struct net *net,
- struct nf_exp_event_notifier *nb);
- static inline void
- nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
- struct nf_conntrack_expect *exp,
- u32 portid,
- 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(net->ct.nf_expect_event_cb);
- if (notify == NULL)
- goto out_unlock;
- 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,
- .portid = portid,
- .report = report
- };
- notify->fcn(1 << event, &item);
- }
- out_unlock:
- rcu_read_unlock();
- }
- static inline void
- nf_ct_expect_event(enum ip_conntrack_expect_events event,
- struct nf_conntrack_expect *exp)
- {
- nf_ct_expect_event_report(event, exp, 0, 0);
- }
- int nf_conntrack_ecache_pernet_init(struct net *net);
- void nf_conntrack_ecache_pernet_fini(struct net *net);
- int nf_conntrack_ecache_init(void);
- void nf_conntrack_ecache_fini(void);
- static inline void nf_conntrack_ecache_delayed_work(struct net *net)
- {
- if (!delayed_work_pending(&net->ct.ecache_dwork)) {
- schedule_delayed_work(&net->ct.ecache_dwork, HZ);
- net->ct.ecache_dwork_pending = true;
- }
- }
- static inline void nf_conntrack_ecache_work(struct net *net)
- {
- if (net->ct.ecache_dwork_pending) {
- net->ct.ecache_dwork_pending = false;
- mod_delayed_work(system_wq, &net->ct.ecache_dwork, 0);
- }
- }
- #else /* CONFIG_NF_CONNTRACK_EVENTS */
- static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
- struct nf_conn *ct) {}
- static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
- struct nf_conn *ct,
- u32 portid,
- int report) { return 0; }
- static inline int nf_conntrack_event(enum ip_conntrack_events event,
- struct nf_conn *ct) { return 0; }
- static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
- struct nf_conn *ct,
- u32 portid,
- int report) { return 0; }
- static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
- static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
- struct nf_conntrack_expect *exp) {}
- static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
- struct nf_conntrack_expect *exp,
- u32 portid,
- int report) {}
- static inline int nf_conntrack_ecache_pernet_init(struct net *net)
- {
- return 0;
- }
- static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
- {
- }
- static inline int nf_conntrack_ecache_init(void)
- {
- return 0;
- }
- static inline void nf_conntrack_ecache_fini(void)
- {
- }
- static inline void nf_conntrack_ecache_delayed_work(struct net *net)
- {
- }
- static inline void nf_conntrack_ecache_work(struct net *net)
- {
- }
- #endif /* CONFIG_NF_CONNTRACK_EVENTS */
- #endif /*_NF_CONNTRACK_ECACHE_H*/
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