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