include/net/netfilter/nf_conntrack_ecache.h

Source file repositories/reference/linux-study-clean/include/net/netfilter/nf_conntrack_ecache.h

File Facts

System
Linux kernel
Corpus path
include/net/netfilter/nf_conntrack_ecache.h
Extension
.h
Size
4924 bytes
Lines
188
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct nf_conntrack_ecache {
	unsigned long cache;		/* bitops want long */
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
	local64_t timestamp;		/* event timestamp, in nanoseconds */
#endif
	u16 ctmask;			/* bitmask of ct events to be delivered */
	u16 expmask;			/* bitmask of expect events to be delivered */
	u32 missed;			/* missed events */
	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 bool nf_ct_ecache_exist(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_EVENTS
	return nf_ct_ext_exist(ct, NF_CT_EXT_ECACHE);
#else
	return false;
#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_exp_event {
	struct nf_conntrack_expect *exp;
	u32 portid;
	int report;
};

struct nf_ct_event_notifier {
	int (*ct_event)(unsigned int events, const struct nf_ct_event *item);
	int (*exp_event)(unsigned int events, const struct nf_exp_event *item);
};

void nf_conntrack_register_notifier(struct net *net,
				   const struct nf_ct_event_notifier *nb);
void nf_conntrack_unregister_notifier(struct net *net);

void nf_ct_deliver_cached_events(struct nf_conn *ct);
int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
				  u32 portid, int report);

bool nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp);
#else

static inline void nf_ct_deliver_cached_events(const 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 bool nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
{
	return false;
}
#endif

static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_EVENTS
	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);

Annotation

Implementation Notes