/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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enum nf_ct_ecache_state {
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NFCT_ECACHE_UNKNOWN, /* destroy event not sent */
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NFCT_ECACHE_DESTROY_FAIL, /* tried but failed to send destroy event */
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NFCT_ECACHE_DESTROY_SENT, /* sent destroy event after failure */
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};
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struct nf_conntrack_ecache {
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unsigned long cache; /* bitops want long */
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u16 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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enum nf_ct_ecache_state state:8;/* ecache state */
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u32 portid; /* netlink portid 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 portid;
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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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int nf_conntrack_register_notifier(struct net *net,
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struct nf_ct_event_notifier *nb);
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void nf_conntrack_unregister_notifier(struct net *net,
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struct nf_ct_event_notifier *nb);
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void nf_ct_deliver_cached_events(struct nf_conn *ct);
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int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
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u32 portid, int report);
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#else
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static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct)
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{
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}
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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 portid,
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int report)
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{
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return 0;
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}
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#endif
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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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#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 (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
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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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#endif
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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 portid, int report)
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{
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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const struct net *net = nf_ct_net(ct);
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if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
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return 0;
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return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
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#else
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return 0;
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#endif
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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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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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const struct net *net = nf_ct_net(ct);
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if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
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return 0;
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return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
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#else
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return 0;
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#endif
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}
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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struct nf_exp_event {
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struct nf_conntrack_expect *exp;
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u32 portid;
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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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int nf_ct_expect_register_notifier(struct net *net,
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struct nf_exp_event_notifier *nb);
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void nf_ct_expect_unregister_notifier(struct net *net,
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struct nf_exp_event_notifier *nb);
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void 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 portid, int report);
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void nf_conntrack_ecache_pernet_init(struct net *net);
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void nf_conntrack_ecache_pernet_fini(struct net *net);
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int nf_conntrack_ecache_init(void);
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void nf_conntrack_ecache_fini(void);
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#else /* CONFIG_NF_CONNTRACK_EVENTS */
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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 portid,
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int report)
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{
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}
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static inline void nf_conntrack_ecache_pernet_init(struct net *net)
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{
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}
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static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
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{
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}
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static inline int nf_conntrack_ecache_init(void)
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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(void)
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{
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}
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#endif /* CONFIG_NF_CONNTRACK_EVENTS */
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static inline void nf_conntrack_ecache_delayed_work(struct net *net)
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{
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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if (!delayed_work_pending(&net->ct.ecache_dwork)) {
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schedule_delayed_work(&net->ct.ecache_dwork, HZ);
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net->ct.ecache_dwork_pending = true;
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}
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#endif
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}
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static inline void nf_conntrack_ecache_work(struct net *net)
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{
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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if (net->ct.ecache_dwork_pending) {
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net->ct.ecache_dwork_pending = false;
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mod_delayed_work(system_wq, &net->ct.ecache_dwork, 0);
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}
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#endif
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}
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#endif /*_NF_CONNTRACK_ECACHE_H*/
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