include/net/inetpeer.h

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

File Facts

System
Linux kernel
Corpus path
include/net/inetpeer.h
Extension
.h
Size
3304 bytes
Lines
151
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 ipv4_addr_key {
	__be32	addr;
	int	vif;
};

#define INETPEER_MAXKEYSZ   (sizeof(struct in6_addr) / sizeof(u32))

struct inetpeer_addr {
	union {
		struct ipv4_addr_key	a4;
		struct in6_addr		a6;
		u32			key[INETPEER_MAXKEYSZ];
	};
	__u16				family;
};

struct inet_peer {
	struct rb_node		rb_node;
	struct inetpeer_addr	daddr;

	u32			metrics[RTAX_MAX];
	u32			rate_tokens;	/* rate limiting for ICMP */
	u32			n_redirects;
	unsigned long		rate_last;
	/*
	 * Once inet_peer is queued for deletion (refcnt == 0), following field
	 * is not available: rid
	 * We can share memory with rcu_head to help keep inet_peer small.
	 */
	union {
		struct {
			atomic_t			rid;		/* Frag reception counter */
		};
		struct rcu_head         rcu;
	};

	/* following fields might be frequently dirtied */
	__u32			dtime;	/* the time of last use of not referenced entries */
	refcount_t		refcnt;
};

struct inet_peer_base {
	struct rb_root		rb_root;
	seqlock_t		lock;
	int			total;
};

void inet_peer_base_init(struct inet_peer_base *);

void inet_initpeers(void) __init;

#define INETPEER_METRICS_NEW	(~(u32) 0)

static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip)
{
	iaddr->a4.addr = ip;
	iaddr->a4.vif = 0;
	iaddr->family = AF_INET;
}

static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr)
{
	return iaddr->a4.addr;
}

static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,
					struct in6_addr *in6)
{
	iaddr->a6 = *in6;
	iaddr->family = AF_INET6;
}

static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
{
	return &iaddr->a6;
}

/* can be called with or without local BH being disabled */
struct inet_peer *inet_getpeer(struct inet_peer_base *base,
			       const struct inetpeer_addr *daddr);

static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
						__be32 v4daddr,
						int vif)
{
	struct inetpeer_addr daddr;

	daddr.a4.addr = v4daddr;
	daddr.a4.vif = vif;
	daddr.family = AF_INET;

Annotation

Implementation Notes